INCREDIBLE: Scientists discover the first planet outside our Galaxy – in another galaxy!! – My Comments

[The state of Western science is insane. These distances are beyond imagination and all this equipment and these methods were invented by Whites. Just read this article and try to grasp the insane distances that are involved. The accuracy of our science is beyond imagination. Truly. Jan]

Astronomers have found hints of what could be the first planet ever to be discovered outside our galaxy.

Nearly 5,000 "exoplanets" – worlds orbiting stars beyond our Sun – have been found so far, but all of these have been located within the Milky Way galaxy.

The possible Saturn-sized planet discovered by Nasa’s Chandra X-Ray Telescope is in the Messier 51 galaxy.

This is located some 28 million light-years away from the Milky Way.

This new result is based on transits, where the passage of a planet in front of a star blocks some of the star’s light and yields a characteristic dip in brightness that can be detected by telescopes.

This general technique has already been used to find thousands of exoplanets.

Dr Rosanne Di Stefano and colleagues searched for dips in the brightness of X-rays received from a type of object known as an X-ray bright binary.

These objects typically contain a neutron star or black hole pulling in gas from a closely orbiting companion star. The material near the neutron star or black hole becomes superheated and glows at X-ray wavelengths.

Because the region producing bright X-rays is small, a planet passing in front of it could block most or all of the rays, making the transit easier to spot.

The team members used this technique to detect the exoplanet candidate in a binary system called M51-ULS-1.

"The method we developed and employed is the only presently implementable method to discover planetary systems in other galaxies," Dr Di Stefano, from the Harvard-Smithsonian Center for Astrophysics in Cambridge, US, told BBC News.

"It is a unique method, uniquely well-suited to finding planets around X-ray binaries at any distance from which we can measure a light curve."

The Chandra telescope was launched in 1999 to study X-ray emission from hot regions of the Universe

Future planet-hunting

This binary contains a black hole or neutron star orbiting a companion star with a mass about 20 times that of the Sun. A neutron star is the collapsed core of what had once been a massive star.

The transit lasted about three hours, during which the X-ray emission decreased to zero. Based on this and other information, the astronomers estimate that the candidate planet would be around the size of Saturn, and orbit the neutron star or black hole at about twice the distance Saturn lies from the Sun.

Dr Di Stefano said the techniques that have been so successful for finding exoplanets in the Milky Way break down when observing other galaxies. This is partly because the great distances involved reduce the amount of light which reaches the telescope and also mean that many objects are crowded into a small space (as viewed from Earth), making it difficult to resolve individual stars.

With X-rays, she said, "there may be only several dozen sources spread out over the entire galaxy, so we can resolve them. In addition, a subset of these are so bright in X-rays that we can measure their light curves.

"Finally, the huge emission of X-rays comes from a small region that can be substantially or (as in our case) totally blocked by a passing planet."

Messier 51 is also called the Whirlpool Galaxy because of its distinctive spiral shape

The researchers freely admit that more data is needed to verify their interpretation.

One challenge is that the planet candidate’s large orbit means it would not cross in front of its binary partner again for about 70 years, quashing any attempts to make a follow-up observation in the near-term.

One other possible explanation that the astronomers considered is that the dimming has been caused by a cloud of gas and dust passing in front of the X-ray source.

However, they think this is unlikely, because the characteristics of the event do not match up with the properties of a gas cloud.

"We know we are making an exciting and bold claim so we expect that other astronomers will look at it very carefully," said co-author Julia Berndtsson of Princeton University, New Jersey.

"We think we have a strong argument, and this process is how science works."

Dr Di Stefano said that the new generation of optical and infrared telescopes would not be able to compensate for the problems of crowding and dimness, so observations at X-ray wavelengths would likely remain the primary method for detecting planets in other galaxies.

However, she said a method known as microlensing might also hold promise for identifying extra-galactic planets.

The study has been published in the peer-reviewed journal Nature Astronomy.

Source: https://www.bbc.com/news/science-environment-59044650?utm_source=Nature+Briefing&utm_campaign=7a8f0a1880-briefing-dy-20211026&utm_medium=email&utm_term=0_c9dfd39373-7a8f0a1880-46019854

Science: Excellent: Exoplanet tally set to pass 4,000 mark – My Comments

[I have been following the topic of exo-planets – planets outside the solar system for some years now. The rate of discovery is picking up faster and faster. I suspect that when new specialised satellites get going, you'll see the pace of discoveries picking up EXPONENTIALLY FASTER. I suspect within a decade or two they'll be finding planets at insane speeds and the discoveries will run into the millions and later the billions – just like with stars. It's going to be incredible. Western science totally smokes. Jan]

The number of planets detected around other stars – or exoplanets – is set to hit the 4,000 mark.

The huge haul is a sign of the explosion of findings from searches with telescopes on the ground and in space over the last 25 years.

It’s also an indication of just how common planets are – with most stars in the Milky Way hosting at least one world in orbit around them.

That’s something astronomers couldn’t be certain of just 30 years ago.

The Extrasolar Planets Encyclopedia, run by the Observatoire de Paris, has already passed the 4,000 mark.

Dr Françoise Roques, from the observatory, who is on the scientific board of the encyclopedia, told BBC News: "The great news is that we shift from a starry sky to a planetary sky, as there are more planets than stars.

"And also that the planetary systems have great diversity of structure, with planets orbiting zero, one, two… stars, or other planets."

The Nasa Exoplanet Archive is 74 planets away from the milestone. But there are 443 planet candidates detected by Nasa’s Tess space telescope (launched in 2018) awaiting confirmation.

There are a further 2,423 candidates detected by the Kepler space telescope.

The latest exoplanet to be added to the Nasa archive was the Super Earth GI 686 b, which orbits a red dwarf star (a type cooler than our Sun) which was discovered using ground telescopes. It was added on 21 March.

The total number of confirmed planets differs between the two catalogues because of slightly different acceptance criteria – along with other factors.

The early technique of detecting new worlds by the "wobble" induced by a planet’s gravitational tug on its star yielded many giant planets known as "hot Jupiters", which orbited close to their stars. These planet types were easier to detect using the wobble method.

Nasa’s Kepler space telescope was launched in 2009; it used a different technique known as the transit method to measure the dip in brightness as a planet passed in front of its host star. Kepler discovered hundreds of Neptune-sized planets and those that fell into a category known as Super Earths (those having a mass larger than Earth’s but below those of Neptune-sized planets).

Dr Roques said it remained a difficult task to distinguish between a type of star known as a brown dwarf and giant planets.

"Four-thousand is just a number as the frontier of the planet domain is uncertain," she said.

"The brown dwarfs have been defined by the [IAU – International Astronomical
Union] as small stars, but in fact, some of them are big planets. Our database collects objects until 60 Jupiter masses and contains a mix of the planetary brown dwarfs (formed in a protoplanetary disk around a star) and starry brown dwarfs (formed by collapse of interstellar cloud).

"The only way to ensure the difference is to access its internal structure, which is a difficult/ impossible task."

The first exoplanets were found around a pulsar – a highly magnetised neutron star – in 1992 by Aleksander Wolszczan and Dale Frail.

The initial discovery of a planet around a main sequence star – those that fuse hydrogen into helium within their cores – was made in 1995 by astronomers Didier Queloz and Michel Mayor.

Dr Roque explained: "For the field of exoplanet exploration, we [are
going] from discovery projects to exploration projects, for a better understanding of the structure, formation, atmosphere and, of course habitability of exoplanets."

Source: https://www.bbc.com/news/science-environment-47681239

Photo: Earth has had TWO Moons for the last 3 years…

[This is quaint. We have pieces of rock that come into orbit and later leave. Jan]

Until recently, many of us earthlings were blissfully unaware that our planet had gained a second moon. But now 2020 CD3 has become such a superstar, we’re using giant telescopes just to catch a glimpse of it.

Part-time paparazzi, full-time astronomers at the Gemini Observatory in Hawaii snapped the stunning pictures of the car-sized carbonaceous rock using the 8-meter Gemini North telescope.

The image is actually a combination of three separate images using three different filters to capture our new natural satellite in all its glory.

"Obtaining the images was a scramble for the Gemini team because the object is quickly becoming fainter as it moves away from Earth," explains Gemini Observatory astronomer John Blakeslee, adding that the new celestial superstar 2020 CD3 is expected to leave us forever some time in April.

Fear not, as there are already rumors circulating of a new generation of mini-moons that could already be orbiting the Earth.

"We expect to find a population of these objects once the Rubin Observatory is operational," said Grigori Fedorets, the lead astronomer for the Gemini observations, referencing the Vera C. Rubin Observatory, whose sole purpose will be to scan the skies for similar, previously unknown, objects.

Source: https://www.rt.com/news/481914-astronomers-first-color-photo-minimoon/

Amazing Science: These 125 million-year-old fossils may hold dinosaur DNA – My Comments

[This is astounding. This normally is not possible. This is moving things to a whole new level as bits and pieces of older and older DNA is found … something previously impossible! So much can be learned from this. Jan]

The remnants of DNA may lurk in 125 million-year-old dinosaur fossils found in China. If the microscopic structures are indeed DNA, they would be the oldest recorded preservation of chromosome material in a vertebrate fossil.

DNA is coiled inside chromosomes within a cell’s nucleus. Researchers have reported possible cell nucleus structures in fossils of plants and algae dating back millions of years. Scientists have even suggested that a set of microfossils from 540 million years ago might hold preserved nuclei.

These claims are often controversial, because it can be hard to distinguish a fossilized nucleus from a random blob of mineralization created during the fossilization process. In the new study, published Sept. 24 in the journal Communications Biology, researchers compared fossilized cartilage from the feathered, peacock-size dinosaur Caudipteryx with cells from modern chickens; they found structures in the fossils that looked much like chromatin, or threads of DNA and protein.

"The fact that they are seeing this is really interesting, and it suggests we need to do more research as to what happens to DNA and chromosomes after cell death," said Emily Carlisle, a doctoral student who studies microscopic fossils and their preservation at the University of Bristol in England but was not involved in the new research.

To answer the obvious burning question: No, we’re nowhere close to resurrecting dinosaurs from their fossilized DNA.

"If there is any DNA or DNA-like molecule in there, it will be — as a scientific guess — very, very chemically modified and altered," Alida Bailleul, a paleobiologist at the Chinese Academy of Sciences who led the new research, wrote in an email to Live Science.

However, Bailleul said, if paleontologists can identify chromosome material in fossils, they may someday be able to unravel snippets of a genetic sequence. This could reveal a little more about dinosaur physiology.

But first, researchers have to find out if the DNA is even there. Until recently, most paleontologists thought that rot and decay destroyed the contents of cells before fossilization could take hold. Any microscopic structures inside cells were considered collapsed cell contents, such as organelles and membranes, that had rotted before mineralization, Carlisle told Live Science. More recently, though, paleontologists have found legitimate cell structures in a few fossils. For example, 190 million-year-old fern cells described in 2014 in the journal Science were buried in volcanic ash and fossilized so quickly that some were frozen in the process of cell division. Unmistakable chromosomes are visible in some of these cells.

In 2020, Bailleul and her colleagues reported the possible preservation of DNA in the skull of an infant Hypacrosaurus, a kind of duck-billed dinosaur that lived 75 million years ago, found in Montana. The possible DNA was found in cartilage, the connective tissue that makes up the joints.

For the new study, the researchers turned to a well-preserved specimen of Caudipteryx held by the Shandong Tianyu Museum of Nature in China. Originally discovered in the northeastern province of Liaoning, the fossil has ample preserved cartilage, which the researchers stained with the same dyes used to image DNA in modern tissue. These dyes bind to DNA and turn it a specific color, depending on the dye, allowing the DNA to stand out against the rest of the nucleus. By examining the stained, fossilized cartilage with several microscopy methods, Bailleul and her team showed that the cartilage cells contain structures that look just like nuclei with a scramble of chromatin inside.

The stained dinosaur nuclei’s resemblance to modern cells doesn’t prove there is DNA inside them, though, Bailleul cautioned. "What it means is that there are definitely parts of original organic molecules, perhaps some original DNA in there, but we don’t know that yet for sure," she said. "We just need to go figure out exactly what these organic molecules are."

The imaging definitely seems to show nuclei, Carlisle said, but it’s harder to identify fossilized chromosomes, because no one really knows what happens to chromosomes as they decay. It’s possible that the contents of the nucleus might just collapse into structures that look like chromosomes but are really just a jumble of meaningless mineralized junk; it’s also possible that the fossilization process preserves some of the original molecular structure. (One 2012 study suggests that DNA in bone will completely break down in about 7 million years, but the timing may depend heavily on environmental factors.)

"It would be really interesting to do more experiments into that, looking at what happens inside the nuclei instead of just what happens to it from the surface," Carlisle said.

Bailleul and her colleagues hope to collect more chemical data to nail down the identity of the mysterious structures.

"I hope we can reconstruct a sequence, someday, somehow," she said. "Let’s see: I could be wrong, but I could also be right."

Source: https://www.livescience.com/dinosaur-dna-fossils.html?utm_source=SmartBrief&utm_medium=email&utm_campaign=368B3745-DDE0-4A69-A2E8-62503D85375D&utm_content=FDA2F203-A8D8-4A6F-8372-A21AA22D887C&utm_term=23709803-d360-4259-9c73-be4ff46b5c71

Science: New type of dark energy could solve Universe expansion mystery

Hints of a previously unknown, primordial form of the substance could explain why the cosmos now seems to be expanding faster than theory predicts.

Data from the Atacama Cosmology Telescope suggest the existence of two types of dark energy at the very start of the Universe.

Cosmologists have found signs that a second type of dark energy — the ubiquitous but enigmatic substance that is pushing the current Universe’s expansion to accelerate — might have existed in the first 300,000 years after the Big Bang.

Two separate studies — both posted on the arXiv preprint server in the past week 1,2 — have detected a tentative first trace of this ‘early dark energy’ in data collected between 2013 and 2016 by the Atacama Cosmology Telescope (ACT) in Chile. If the findings are confirmed, they could help to solve a long-standing conundrum surrounding data about the early Universe, which seem to be incompatible with the rate of cosmic expansion measured today. But the data are preliminary and don’t show definitively whether this form of dark energy really existed.

“There are a number of reasons to be careful to take this as a discovery of new physics,” says Silvia Galli, a cosmologist at the Paris Institute of Astrophysics.

The authors of both preprints — one posted by the ACT team, and the other by an independent group — admit that the data are not yet strong enough to detect early dark energy with high confidence. But they say that further observations from the ACT and another observatory, the South Pole Telescope in Antarctica, could provide a more stringent test soon. “If this really is true — if the early Universe really did feature early dark energy — then we should see a strong signal,” says Colin Hill, a co-author of the ACT team’s paper1 who is a cosmologist at Columbia University in New York City.

Mapping the CMB

Both the ACT and the South Pole Telescope are designed to map the cosmic microwave background (CMB), primordial radiation sometimes described as the afterglow of the Big Bang. The CMB is one of the pillars of cosmologists’ understanding of the Universe. By mapping subtle variations in the CMB across the sky, researchers have found compelling evidence for the ‘standard model of cosmology’. This model describes the evolution of a Universe containing three primary ingredients: dark energy; the equally mysterious dark matter, which is the primary cause of the formation of galaxies; and ordinary matter, which accounts for less than 5% of the Universe’s total mass and energy.

Current state-of-the-art CMB maps were provided by the European Space Agency’s Planck mission, which was active between 2009 and 2013. Calculations based on Planck data predict — assuming that the standard model of cosmology is correct — exactly how fast the Universe should be expanding now. But for the past decade or so, increasingly accurate measurements of that expansion, based on observations of supernova explosions and other techniques, have found it to be 5–10% faster3.

How fast is the Universe expanding? Cosmologists just got more confused

Theorists have suggested a plethora of modifications to the standard model that could explain this difference. Two years ago, cosmologist Marc Kamionkowski at Johns Hopkins University in Baltimore, Maryland, and his collaborators suggested an extra ingredient for the standard model4. Their ‘early dark energy’ — which made more precise an idea that they and other teams had been working on for several years — would be a sort of fluid that permeated the Universe before withering away within a few hundred thousand years of the Big Bang. “It’s not a compelling argument, but it’s the only model we can get to work,” says Kamionkowski.

Early dark energy would not have been strong enough to cause an accelerated expansion, as ‘ordinary’ dark energy is currently doing. But it would have caused the plasma that emerged from the Big Bang to cool down faster than it would have otherwise. This would affect how CMB data should be interpreted — especially when it comes to measurements of the age of the Universe and its rate of expansion that are based on how far sound waves were able to travel in the plasma before it cooled into gas. Planck and similar observatories use features that were left in the sky after this transition to make such calculations.

The two latest studies find that the ACT’s map of the CMB’s polarization fits better with a model including early dark energy than with the standard one. Interpreting the CMB on the basis of the early dark energy model and ACT data would mean that the Universe is now 12.4 billion years old, about 11% younger than the 13.8 billion years calculated using the standard model, says Hill. Correspondingly, the current expansion would be about 5% faster than the standard model predicts — closer to what astronomers calculate today.

Inconsistencies remain

Hill says that he was previously sceptical about early dark energy, and that his team’s findings surprised him. Vivian Poulin, an astrophysicist at the University of Montpellier in France and a co-author of the second study2 based on ACT data, says it was reassuring that his team’s analysis agreed with the ACT team’s own. “The lead authors are very, very hard-nosed, conservative people, who really understand the data and the measurements,” Kamionkowski says.

But Galli warns that the ACT data seem to be inconsistent with calculations by the Planck team, which she was part of. And although the ACT’s polarization data might favour early dark energy, it is unclear whether its other major set of data — its map of CMB temperatures — shows such a preference. For these reasons, she adds, it will be crucial to cross-check the results using the South Pole Telescope, an experiment she is part of.

Wendy Freedman, an astronomer at the University of Chicago in Illinois who has contributed to some of the most precise measurements of cosmic expansion, says that the ACT-based results are interesting, if preliminary. “It is important to pursue different models” and compare them with the standard one, she says.

doi: https://doi.org/10.1038/d41586-021-02531-5

Source: https://www.nature.com/articles/d41586-021-02531-5?utm_source=Nature+Briefing&utm_campaign=51bb877e21-briefing-dy-20210917&utm_medium=email&utm_term=0_c9dfd39373-51bb877e21-46019854

Science: Curiosity rover discovers that evidence of past life on Mars may have been erased

The surprising discovery doesn’t make it any less likely that scientists will find life on the Red Planet.

Evidence of ancient life may have been scrubbed from parts of Mars, a new NASA study has found.

The space agency’s Curiosity rover made the surprising discovery while investigating clay-rich sedimentary rocks around its landing site in Gale Crater, a former lake that was made when an asteroid struck the Red Planet roughly 3.6 billion years ago.

Clay is a good signpost towards evidence of life because it’s usually created when rocky minerals weather away and rot after contact with water — a key ingredient for life. It is also an excellent material for storing microbial fossils.

But when Curiosity took two samples of ancient mudstone, a sedimentary rock containing clay, from patches of the dried-out lake bed, dated to the same time and place (3.5 billion years ago and just 400m apart), researchers found that one patch contained only half the expected amount of clay minerals. Instead, that patch held a greater quantity of iron oxides, the compounds that give Mars its rusty hue.

The team believes the culprit behind this geological disappearing act is brine: supersalty water that leaked into the mineral-rich clay layers and destabilized them, flushing them away and wiping patches of both the geological — and possibly even the biological — record clean.

"We used to think that once these layers of clay minerals formed at the bottom of the lake in Gale Crater, they stayed that way, preserving the moment in time they formed for billions of years," study lead author Tom Bristow, a researcher at NASA’s Ames Research Center in Mountain View, California, said in a statement. "But later brines broke down these clay minerals in some places — essentially resetting the rock record."

The rover completed its analysis by drilling into the layers of the Martian rock before using its chemistry and mineralogy instrument, known as CheMin, to investigate the samples.

The process of chemical transformation in sediments is called diagenesis, and it could have created new life beneath Mars even as it erased some of the evidence of the old life on its surface, according to the study authors. So even though old records of life may have been erased in the brine patches, the chemical conditions brought about by the influx of salty water may have enabled more life to spring up in its place, the scientists said.

"These are excellent places to look for evidence of ancient life and gauge habitability," study co-author John Grotzinger, a geology professor at the California Institute of Technology, said in the statement. "Even though diagenesis may erase the signs of life in the original lake, it creates the chemical gradients necessary to support subsurface life, so we are really excited to have discovered this."

Curiosity’s mission to Mars began nine years ago, but the rover has continued to study the Red Planet well past its initial two-year mission timeline, to establish the historic habitability of Mars for life. It is now working in collaboration with the new Perseverance Mars rover, which landed in February 2021 and has been tasked with collecting rock and soil samples for a possible return to Earth.

The research done by Curiosity has not only revealed how the Martian climate changed but also helped Perseverance determine which soil samples to collect to increase the odds of finding life.

"We’ve learned something very important: There are some parts of the Martian rock record that aren’t so good at preserving evidence of the planet’s past and possible life," co-author Ashwin Vasavada, a Curiosity project scientist at NASA’s Jet Propulsion Laboratory in California, said in the statement. "The fortunate thing is, we find both close together in Gale Crater and can use mineralogy to tell which is which."

The search for life on Mars has been given fresh impetus by a new study that could have triangulated the possible location of the six methane emissions detected by the Curiosity rover during its time in Gale crater, Live Science reported. Since all of the methane in Earth’s atmosphere comes from biological sources, scientists are thrilled to find the gas on Mars.

The researchers published their findings July 9 in the journal Science.

Source: https://www.livescience.com/mars-life-evidence-erased.html

Science: Can Sharks clone themselves?

[This is a fascinating little excerpt I came across. This is clearly not a common thing, but even so, this is definitely strange. Jan]

In a story about Sharks, it had this interesting piece:

Some captive female sharks have been known to reproduce without the aid of a male, essentially cloning themselves, Shiffman said. In 2001, a female hammerhead shark gave birth in the Henry Doorly Zoo in Nebraska without mating with a male, taking researchers by surprise. It’s an example of parthenogenesis, wherein embryos can be created with external fertilization, and has been seen in all types of animals except for mammals.

Source: https://www.livescience.com/38701-8-weird-facts-about-sharks.html

Science: Great new weird discovery: Physicists give weird new phase of matter an extra dimension

[This is fascinating. Some of this stuff is taking us well into the incredible unknown…. science fiction stuff. Jan]

Physicists have created the first ever two-dimensional supersolid — a bizarre phase of matter that behaves like both a solid and a frictionless liquid at the same time.

Supersolids are materials whose atoms are arranged into a regular, repeating, crystal structure, yet are also able to flow forever without ever losing any kinetic energy. Despite their freakish properties, which appear to violate many of the known laws of physics, physicists have long predicted them theoretically — they first appeared as a suggestion in the work of the physicist Eugene Gross as early as 1957.

Now, using lasers and super-chilled gases, physicists have finally coaxed a supersolid into a 2D structure, an advancement that could enable scientists to crack the deeper physics behind the mysterious properties of the weird matter phase.

Related: 12 stunning quantum physics experiments

Of particular interest to the researchers is how their 2D supersolids will behave when they’re spun in a circle, alongside as the tiny little whirlpools, or vortices, that will pop up inside them.

"We expect that there will be much to learn from studying rotational oscillations, for example, as well as vortices that can exist within a 2D system much more readily than in 1D," lead author Matthew Norcia, a physicist at Innsbruck University’s Institute for Quantum Optics and Quantum Information (IQOQI) in Austria, told Live Science in an email.

To create their supersolid, the team suspended a cloud of dysprosium-164 atoms inside optical tweezers before cooling the atoms down to just above zero Kelvin (minus 459.67 degrees Fahrenheit, or minus 273.15 degrees Celsius) using a technique called laser-cooling.

Firing a laser at a gas typically heats it up, but if the photons (light particles) in the laser beam are traveling in the opposite direction of the moving gas particles, they can actually cause slow and cool the gas particles. After cooling the dysprosium atoms as far as they could with the laser, the researchers loosened the "grip" of their optical tweezers, creating just enough space for the most energetic atoms to escape.

Since "warmer" particles jiggle faster than cooler ones, this technique, called evaporative cooling, left the researchers with just their super-cooled atoms; and these atoms had been transformed into a new phase of matter — a Bose-Einstein condensate: a collection of atoms that have been super-cooled to within a hair’s breadth of absolute zero.

When a gas is cooled to near zero temperature, all its atoms lose their energy, entering into the same energy states. As we can only distinguish between the otherwise identical atoms in a gas cloud by looking at their energy levels, this equalizing has a profound effect: The once disparate cloud of vibrating, jiggling, colliding atoms that make up a warmer gas then become, from a quantum mechanical point of view, perfectly identical.

This opens the door to some truly weird quantum effects. One key rule of quantum behavior, Heisenberg’s uncertainty principle, says you cannot know both a particle’s position and its momentum with absolute accuracy. Yet, now that the Bose-Einstein condensate atoms are no longer moving, all of their momentum is known. This leads to the atoms’ positions becoming so uncertain that the places they could possibly occupy grow to be larger in area than the spaces between the atoms themselves.

Instead of discrete atoms, then, the overlapping atoms in the fuzzy Bose-Einstein condensate ball act as if they are just one giant particle. This gives some Bose-Einstein condensates the property of superfluidity — allowing their particles to flow without any friction. In fact, if you were to stir a mug of a superfluid Bose-Einstein condensate, it would never stop swirling.

The researchers used dysprosium-164 (an isotope of dysprosium) because it (alongside its neighbor on the periodic table Holmium) is the most magnetic of any discovered element. This means that when the dysprosium-164 atoms were supercooled, in addition to becoming a superfluid, they also clumped together into droplets, sticking to each other like little bar magnets.

By "carefully tuning the balance between long-range magnetic interactions and short-range contact interactions between atoms," Norcia said, the team was able to make a long, one dimensional tube of droplets that also contained free-flowing atoms — a 1D supersolid. That was their previous work.

To make the leap from a 1D to a 2D supersolid, the team used a larger trap and dropped the intensity of their optical tweezer beams across two directions. This, alongside keeping enough atoms in the trap to maintain a high enough density, finally allowed them to create a zig-zag structure of droplets, similar to two offset 1D tubes sitting next to each other, a 2D supersolid.

With the task of its creation behind them, the physicists now want to use their 2D supersolid to study all of the properties that emerge from having this extra dimension. For instance, they plan to study vortices that emerge and are trapped between the droplets of the array, especially as these eddies of swirling atoms, at least in theory, can spiral forever.

This also brings researchers one step closer to the bulk, 3D, supersolids envisioned by early proposals like Gross’, and the even more alien properties they may have.

The researchers published their findings Aug. 18 in the journal Nature.

Source: https://www.livescience.com/first-2d-supersolid.html?utm_source=SmartBrief&utm_medium=email&utm_campaign=368B3745-DDE0-4A69-A2E8-62503D85375D&utm_content=C9CD1E7B-5808-4D61-9CFD-A048B7CD63FB&utm_term=23709803-d360-4259-9c73-be4ff46b5c71

White Science does incredible new stuff: Fusion experiment breaks record, blasts out 10 quadrillion watts of power

[This is astounding. Jan]

Scientists used an unconventional method of creating nuclear fusion to yield a record-breaking burst of energy of more than 10 quadrillion watts, by firing intense beams of light from the world’s largest lasers at a tiny pellet of hydrogen.

Researchers at the Lawrence Livermore National Laboratory in Northern California said they had focused 192 giant lasers at the National Ignition Facility (NIF) onto a pea-size pellet, resulting in the release of 1.3 megajoules of energy in 100 trillionths of a second — roughly 10% of the energy of the sunlight that hits Earth every moment, and about 70% of the energy that the pellet had absorbed from the lasers. The scientists hope one day to reach the break-even or "ignition" point of the pellet, where it gives off 100% or more energy than it absorbs.

The energy yield is significantly larger than the scientists expected and much greater than the previous record of 170 kilojoules they set in February.

The researchers hope the result will expand their ability to research nuclear fusion weapons, the NIF’s core mission, and that it could lead to new ways to harness energy from nuclear fusion — the process that powers the sun and other stars. Some scientists hope that nuclear fusion could one day be a relatively safe and sustainable method for generating energy on Earth.

"This result is a historic step forward for inertial confinement fusion research, opening a fundamentally new regime for exploration and the advancement of our critical national security missions," Kim Budil, the director of Lawrence Livermore National Laboratory, said in a statement.

CLOSE
Giant lasers
Modern nuclear power plants use nuclear fission, which generates energy by splitting the heavy nuclei of elements like uranium and plutonium into lighter nuclei. But stars can generate even more energy from nuclear fusion, a process of smashing together lighter nuclei to make heavier elements.

Stars can fuse many different elements, including carbon and oxygen, but their main energy source comes from the fusion of hydrogen into helium. Because stars are so large and have such strong gravity, the fusion process takes place at very high pressures within the star.

Most Earthbound efforts to generate energy from fusion, such as the giant ITER project being built in France, instead use a doughnut-shaped chamber called a tokamak to confine a thin plasma of hot, neutron-heavy hydrogen inside strong magnetic fields.

Scientists and engineers have worked for more than 60 years to achieve sustainable nuclear fusion within tokamaks, with only limited success. But some researchers think they will be able to sustain fusion in tokamaks within a few years, Live Science previously reported. (ITER is not projected to do this until after 2035.)

The method developed at Lawrence Livermore National Laboratory is one of a few ways of achieving nuclear fusion without using a tokamak.

Instead, the NFI uses an array of laser-light amplifiers the size of three football fields to focus laser beams on hydrogen fuel pellets in a 33-foot-wide (10 meters) spherical metal "target chamber." These lasers are the world’s most powerful, capable of generating up to 4 megajoules of energy.

The method was originally designed so that scientists could study the behavior of hydrogen in thermonuclear weapons — so-called hydrogen bombs — but scientists think it could also have applications for generating energy from nuclear fusion.

Though stars can fuse many different elements, their main energy source comes from the fusion of hydrogen into helium.

Fusion power
Although the NIF setup couldn’t be used in a fusion power plant — its lasers can only fire about once a day, while a power plant would need to vaporize several fuel pellets every second — there are efforts to modify the process so that it can be used commercially.

Plasma physicist Siegfried Glenzer of the SLAC National Accelerator Laboratory at Stanford University, who previously worked at the Livermore facility but was not involved in the new research, told The New York Times that scientists at SLAC are working on a lower-powered laser system that could fire much more rapidly.

Glenzer hopes energy from nuclear fusion will become prominent in the efforts to replace fossil fuels, which have been dominated by solar energy and other technologies in recent years. "This is very promising for us, to achieve an energy source on the planet that won’t emit CO2," he said in the Times article, referring to the greenhouse gas carbon dioxide.

Physicist Stephen Bodner, who formerly headed laser plasma research at the Naval Research Laboratory in Washington, D.C., but is now retired, is critical of some details of the NIF’s design. But he admits he is surprised by the results, which approached the "ignition" of the pellet — the point where it emits as much or more energy than it absorbed. "They have come close enough to their goal of ignition and break-even to call it a success," Bodner told the Times.

Although Bodner favors a different design, "it demonstrates to the skeptic that there is nothing fundamentally wrong with the laser fusion concept," he said. "It is time for the U.S. to move ahead with a major laser fusion energy program."

Source: https://www.livescience.com/fusion-experiment-record-breaking-energy.html?utm_source=SmartBrief&utm_medium=email&utm_campaign=368B3745-DDE0-4A69-A2E8-62503D85375D&utm_content=C9CD1E7B-5808-4D61-9CFD-A048B7CD63FB&utm_term=23709803-d360-4259-9c73-be4ff46b5c71

Astronomy: Neither Star nor Planet: A Strange Brown Dwarf Puzzles Astronomers

Dan Caselden was up late on November 3, 2018, playing the video game Counter-Strike, when he made astronomy history. Every time he died, he would jump on his laptop to check in on an automated search he was running of NASA space telescope images.

Suddenly, in the early hours of the morning, something bizarre popped into view. “It was very confusing,” said Caselden. “It was moving faster than anything I’ve discovered. It was faint and fast, which made it very weird.”

Caselden emailed the astronomers he was working with as part of the Backyard Worlds: Planet 9 project. Once they ruled out the possibility that it was an image artifact, they realized they were looking at something wholly unusual, an exceedingly faint object 50 light-years away blazing through the galaxy at 200 kilometers per second. It was given the name WISE 1534-1043, but by virtue of its singular characteristics and chance discovery, it soon earned the nickname “The Accident.”

Astronomers now think Caselden found a brown dwarf — a failed star that lacks the necessary bulk to begin nuclear fusion in its core. “It forms like a star,” said Sarah Casewell, an astronomer at the University of Leicester in the U.K. “However, it never gains enough mass to fuse hydrogen into helium and start burning anything.”

The discovery of the Accident highlighted how we still have much to learn about brown dwarfs. These objects range in mass from an estimated 13 times the mass of Jupiter to 75 times or more, but exactly where those two boundaries lie is an ongoing dilemma. “People argue about that in conferences all the time,” said Beth Biller, an astronomer at the University of Edinburgh in the U.K., particularly the lower limit. While 13 Jupiter masses is roughly the mass at which deuterium fusion can take place — the characteristic that differentiates brown dwarfs from gas giant planets — the boundary can vary. “There’s nothing special about 13 Jupiter masses,” said Biller. “It’s completely ad hoc.”

Brown dwarfs also vary greatly in temperature. The hottest ones have surface temperatures of around 2,000 degrees Celsius — “about that of a candle flame,” said Biller. The coldest are below 200 degrees. As they do not have their own source of heat, brown dwarfs will gradually cool over billions of years to these lower temperatures. (Subdwarfs, which blur the boundary further between planets and brown dwarfs, can be cooler still. An object called WISE 0855-0714 is below freezing. “It’s the coldest object we know of outside of our solar system,” said Biller.)

What a brown dwarf might look like up close is also unclear. Despite their name — proposed by astronomer Jill Tarter in 1975 — they are likely not brown. They’re more orange or red. “For better or worse it’s stuck as a name,” said Davy Kirkpatrick, an astronomer at the California Institute of Technology.

They also have atmospheres, and those atmospheres may show some kind of banding and spotlike storms, like on Jupiter. Last year, Biller and her colleagues used these storms to measure the wind speed on a brown dwarf about 34 light-years away. They first watched features in its atmosphere come into and out of view as they rotated, and then compared this speed to a measurement of the object’s interior rotation speed gleaned from its magnetic field. Comparing the two values, the researchers calculated a wind speed of over 2,300 kilometers per hour — more than five times that of Jupiter’s winds.

Because brown dwarfs bridge the gap between stars and planets, they can help us understand both. At the upper end of the mass scale, the boundary between the largest brown dwarfs and the smallest stars can give us insights into how nuclear fusion begins. An object needs to reach temperatures of around 3 million degrees Celsius in its core to kick-start nuclear fusion, said Nolan Grieves of the University of Geneva in Switzerland; this ignites a chain reaction that turns hydrogen into helium. But no one is exactly sure how much mass is needed for that to happen, and at what point a brown dwarf becomes a star. “There’s a lot of aspects of stellar evolution that our knowledge is still pretty uncertain on,” said Biller. “Where that fusion limit is exactly is one of those questions.”

Recent work led by Grieves identified five high-mass brown dwarfs with masses between 77 and 98 times that of Jupiter. “They’re right on the border where hydrogen fusion starts to take place,” said Grieves. It’s unclear at the moment, however, which side of the boundary these five objects actually sit on. “We don’t know the true nature of these objects,” said Grieves, “because they’re so close to this limit.”

Some brown dwarfs may even be so starlike that they could host their own planets. “We know of some brown dwarf systems that look like they have protoplanetary disks around them,” said Kirkpatrick. “And there’s every indication that there are probably brown dwarfs that have their own exoplanets in orbit around them as well. A holy grail is to find a brown dwarf with a transiting exoplanet.”

On the opposite end of the brown dwarf mass scale lies the Accident. It’s an extremely small, cold and faint object — “just barely at the level where we could detect it,” said Kirkpatrick. Astronomers are eager to work out what the difference is between a low-mass brown dwarf and a high-mass gas giant planet. This makes small and faint brown dwarfs like the Accident useful targets.

The Accident also appears to be made of some strange stuff. As the universe ages, supernovas spit out lots of heavier elements such as carbon and oxygen — what astronomers call “metals.” Because of this, old objects that formed early in the universe’s history tend to have few metals, while new objects have more. Yet despite being found in our local solar neighborhood — home mostly to young, metal-rich stars — the Accident appears to be metal-poor. “We think this is probably an older brown dwarf, probably one that was created before the Milky Way had all the metal enrichment it does now,” said Kirkpatrick. Casewell added it was likely “one of the first brown dwarfs formed” in our galaxy, originating in the outer galactic halo surrounding the Milky Way and then migrating inward.

As with so many other phenomena in our universe, the finding highlights that these puzzling yet mysterious objects come in all manner of flavors, and fitting them into rigidly defined categories is no simple task. Caselden, meanwhile, hopes he can contribute more to the field in future, perhaps homing in on similar objects now he knows what to look for. “I want to find another Accident,” he said. “And I want to have it not be an accident.”

Correction: August 5, 2021
An earlier version of this article stated that stellar cores need to reach temperatures of 100 million degrees Celsius to sustain nuclear fusion. While this is true for Sun-like stars, extremely low-mass stars can burn hydrogen at temperatures as low as 3 million degrees Celsius.

Source: https://www.quantamagazine.org/neither-star-nor-planet-a-strange-brown-dwarf-puzzles-astronomers-20210804/