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: 安福县| 定南县| 鲁山县| 乌恰县| 柳河县| 从化市| 富蕴县| 潼关县| 西乌珠穆沁旗| 罗田县| 纳雍县| 沛县| 洛隆县| 尚志市| 邵阳县| 广德县| 怀集县| 吉木乃县| 姜堰市| 安丘市| 象州县| 玉门市| 黔西| 新晃| 图木舒克市| 体育| 松桃| 淳化县| 奉新县| 西丰县| 博湖县| 阳新县| 商水县| 项城市| 观塘区| 临沂市| 伊宁县| 日照市| 临潭县| 郎溪县| 邻水|