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

NASA planet hunter finds Earth-size habitable-zone exoplanet

Source: Xinhua| 2020-01-08 01:48:18|Editor: ZX
Video PlayerClose

WASHINGTON, Jan. 7 (Xinhua) -- NASA's planet-hunting satellite TESS has discovered its first Earth-size planet in its star's habitable zone, according to NASA scientists attending the 235th meeting of the American Astronomical Society in Honolulu.

They used NASA's Spitzer Space Telescope to confirmed the planet called TOI 700 d. Its distance to the host star is just right to allow the presence of liquid water on the surface, according to NASA.

TOI 700 d, one of only a few Earth-size planets discovered in a star's habitable zone so far, is a small, cool M dwarf star located just over 100 light years away in the southern constellation Dorado. It's roughly 40 percent of the sun's mass and size and about half its surface temperature.

The planet measures 20 percent larger than Earth, orbits every 37 days and receives from its star 86 percent of the energy that the sun provides to Earth, according to the study.

The exact conditions on TOI 700 d are unknown, but scientists generated multiple predictive models. One simulation included an ocean-covered planet with a dense, carbon-dioxide-dominated atmosphere similar to what scientists suspect surrounded Mars when it was young.

Another model depicts it as a cloudless, all-land version of modern Earth, where winds flow away from the night side of the planet and converge on the point directly facing the star.

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011100001386860481
主站蜘蛛池模板: 综艺| 梅河口市| 吕梁市| 礼泉县| 阳原县| 京山县| 龙陵县| 灌阳县| 稷山县| 龙州县| 彩票| 磐安县| 兴山县| 凤山县| 莱州市| 丹江口市| 高淳县| 丰顺县| 山东省| 汕头市| 青田县| 洪泽县| 娱乐| 陇川县| 安顺市| 铜山县| 株洲县| 石首市| 墨竹工卡县| 德州市| 南华县| 罗田县| 夏河县| 剑河县| 蓝田县| 太谷县| 京山县| 壶关县| 湟中县| 湖北省| 淳安县|