Set as Homepage - Add to Favorites

日韩欧美成人一区二区三区免费-日韩欧美成人免费中文字幕-日韩欧美成人免费观看-日韩欧美成人免-日韩欧美不卡一区-日韩欧美爱情中文字幕在线

【ポルノ映画 torrent】A tiny star gave birth to an absolute giant. Scientists are puzzled.

Astronomers have ポルノ映画 torrentdiscovered a world outside the solar system about 240 light-yearsaway in spacethat is a freak of nature. 

Somehow, a little red dwarf staronly one-fifth the size of the sungave birth to an enormous baby — an exoplanetthat is a little larger than Saturn, although it weighs about half as much as our ringed gas giant. 

Discovered in a sweepinginvestigation of NASA's Transiting Exoplanet Survey Satellite data, this world, TOI-6894 b, and its host star have set a new record for their incongruous sizes. Together they are the smallest known star to have an orbiting giant planet. If there were a Guinness Book of Galactic Records, this one would have a landslide victory for the titleholder. The star, TOI-6894, is just 60 percent the size of the next smallest star with such a planet.


You May Also Like

The pair's existence breaks all the rules of what scientists know about planet formation. 

"We don’t really understand how a star with so little mass can form such a massive planet!" said Vincent Van Eylen, a researcher at the University College London, in a statement. "By finding planetary systems different from our solar system, we can test our models and better understand how our own solar system formed." 

SEE ALSO: The Webb telescope found something exceedingly rare around a dying star An artist's rendering of NASA's TESS spacecraft flying in space.NASA's TESS mission — short for Transiting Exoplanet Survey Satellite — was designed to find new worlds as they pass in front of their host stars. Credit: NASA illustration

Edward Bryant, who led the research team, found the behemoth first by poring over TESS space telescopedata of over 91,000 small red dwarfs, aka M-type stars. Then he used the European Southern Observatory's Very Large Telescopein Chile to reveal TOI-6894b. 

According to How to Make a Really Humongous Planet 101, it should be difficult — nearly impossible — for stars this tiny to do this. That’s because the disks of gas and dust swirling around young stars are the construction materials for planets. Small stars tend to have smaller and lighter disks.

Mashable Light Speed Want more out-of-this world tech, space and science stories? Sign up for Mashable's weekly Light Speed newsletter. By clicking Sign Me Up, you confirm you are 16+ and agree to our Terms of Use and Privacy Policy. Thanks for signing up!

Gas giants like our own Jupiteror Saturn need a lot of stuff to form their cores. They then are able to attract a lot more gas quickly from their surroundings to collect an atmosphere. The mechanics are called "core accretion," and it seems to work best when the building materials are plentiful.

But TOI-6894b seems to be playing by a different rulebook. It's about 53 times the weight of Earth and made partly of heavy elements, according to a paperon its discovery published in Nature Astronomy. In fact, the exoplanet is thought to have about 12 Earths'-worth of those chemicals. That’s way beyond what most small young stars are thought to have in their midst.

Some scientists don't want to throw the baby out with the bathwater: Though the exoplanet doesn't fit neatly into the core-accretion model, it could have formed in a similar way but with a tweak. Perhaps this world started collecting ingredients to form its core very early in its star's life, when the disk was still chock-full of raw material. Or maybe instead of growing a large core quickly to pull in more gas in a runaway process à la Jupiter-like planets, TOI-6894b could have just kept hoarding gas and heavy elements gradually over time.  

But even that would require a bigger original supply of dust. In a survey sample of 70 disks around small stars, only fivehad enough material to build a planet on the scale of TOI-6894b, according to the new paper.

Another idea, called gravitational instability, suggests the disk could collapse under its own weight to create a planet directly. But the discovery team for TOI-6894 b points out that the process doesn't quite work for something the size of this exoplanet — at least according to computer simulations. 


Related Stories
  • Scientists haven't found a rocky exoplanet with air. But now they have a plan.
  • Spacecraft finds a positively enormous planet 12 times Jupiter's mass
  • The best telescopes for gazing at stars and solar eclipses in 2024
  • The Webb telescope found something exceedingly rare around a dying star
  • Jupiter designed the solar system. Here's what the planet was like as a child.

Whatever the origin story, TOI-6894b is leading the ranks of other known gas giants orbiting small and faint stars that astronomers want to study. Scientists also have their eyes on LHS 3154 b, GJ 3512 b, and TZ Ari b. 

An artist's rendering of a protoplanetary disk surrounding a young starSmall stars tend to have smaller and lighter protoplanetary disks. Credit: NASA / JPL-Caltech illustration

"This discovery will be a cornerstone for understanding the extremes of giant planet formation," Bryant said.

The next step for the research team is to use the James Webb Space Telescopeto study the exoplanet's atmosphere, which will occur within the next year. By measuring the various materials in the planet, the researchers may be able to determine the size and structure of its core. That could answer the question of whether TOI-6894 b formed through one of the known models. 

They also have a hunch the exoplanet's atmosphere is rich in methane, something Webb could help confirm. TOI-6894 b is unusually cool for a gas giant, about 300 degrees Fahrenheit. Most of the gas giants known are "hot Jupiters," with temperatures between 1,340 and 3,140 degrees Fahrenheit. Such a discovery of a relatively chilly gas giant would be very rare, the researchers said.

"Most stars in our galaxy are actually small stars exactly like this," said Daniel Bayliss, a coauthor from the University of Warwick in the United Kingdom. "The fact that this star hosts a giant planet has big implications for the total number of giant planets we estimate exist in our galaxy."

0.1257s , 9903.65625 kb

Copyright © 2025 Powered by 【ポルノ映画 torrent】A tiny star gave birth to an absolute giant. Scientists are puzzled.,Public Opinion Flash  

Sitemap

Top 主站蜘蛛池模板: 国产亚洲欧洲乱码在线 | 国产无套粉嫩白浆 | 911国产在线观看无码专区 | 丰满少妇一级aaaa爱毛片 | 亚洲欧美一区二区三区蜜芽 | 国产精品成人一区二区三区 | 久久精品国产av无码麻豆 | 日本韩国三级观看 | 久久久久人妻一区精品免费看 | 成人av在线播 | 精品久久无码AV片软件 | 精品国产免费第一区二区三区日韩 | 老司机午夜免费福利 | 亚洲精品无码成人A片在线小说 | 国产精品99久久久 | 国产欧美精品亚洲一区二区 | 在线观看老湿视频福利 | 日韩精品无码中文字幕一区二区 | 欧美国产日韩亚洲中文 | 国产cd人妖在线观看 | 91久久精品亚洲一区二区三区 | 国产精品精品自在线拍 | 国产精品亚洲精品久久精品 | 久久中文字幕第三页 | 国产好大好爽久久久久久久 | 无码人妻一区二区三区色欲av | 精品久久久久久免费看 | 桃色激情五月天 | 精品国产欧美一区二区 | 久久草免费线看线看2 | 国产精品69人妻无码久久 | 无套内谢大学处破女 | 麻豆午夜视频 | 欧美97色伦欧美一区二区日韩 | 国产日韩精品在线观看 | 国产精品一区二区高清久久久 | 国产欧美中文手机在线 | 香蕉天天综合网日韩欧影视 | 91在线免费观看网站 | 亚洲精品蜜夜内射 | 国产视频一区二区在线观看 |