国产精品99一区二区三_免费中文日韩_国产在线精品一区二区_日本成人手机在线

Astronomers find a frozen Super-Earth orbiting closest single star to our own

Source: Xinhua| 2018-11-15 17:07:34|Editor: huaxia
Video PlayerClose

WASHINGTON, Nov. 14 (Xinhua) -- An international team discovered a frozen Super-Earth orbiting the second closest star system or the closest single star to our own Sun, according to a study published on Wednesday in the journal Nature.

The cold planet spins around the Bernard's star, our fourth-closest neighboring star overall, after Alpha Centauri's triple-star system. Bernard's star, just six light years from Earth, is smaller and older than our Sun and among the least-active known red dwarfs.

Astronomers stitched data from seven instruments including the Planet Finding Spectrograph on Magellan II telescope at Carnegie Institution for Science in Washington D.C..

"After a very careful analysis, we are over 99 percent confident that the planet is there," said the paper's lead author Ignasi Ribas with Spain's Institute of Space Studies of Catalonia.

Called Barnard's star b, the planet has at least 3.2 times Earth's mass and orbits its star every 233 days at a distance where water would be frozen. The scientists estimated a surface temperature of minus 150 degrees Celsius.

Using the radial velocity technique, astronomers detected the tiny wobbles that the planet's gravity induces in the star's orbit.

They said that the newly found planet's characteristics made it an excellent target for direct imaging using the next generation of instruments such as NASA's Wide Field Infrared Survey Telescope (WFIRST). Enditem

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011100001376086061
主站蜘蛛池模板: 昭平县| 高雄县| 瓮安县| 建湖县| 丹东市| 侯马市| 贵州省| 拉孜县| 沁阳市| 大悟县| 南开区| 东光县| 平罗县| 册亨县| 余姚市| 乌海市| 泉州市| 河曲县| 会同县| 阜城县| 玛纳斯县| 遵化市| 民勤县| 门源| 万源市| 奉新县| 竹山县| 衡山县| 虞城县| 沂南县| 龙井市| 凌海市| 永泰县| 华安县| 内乡县| 靖宇县| 通城县| 土默特左旗| 平和县| 张家川| 江门市|