天文學家發(fā)現(xiàn)有三個太陽的“過熱”行星

天文學家發(fā)現(xiàn)有三個太陽的“過熱”行星

A distant rocky exoplanet has gone one better than Tatooine, Luke Skywalker’s home planet on “Star Wars,” which is famously depicted as having two suns in its sky.

一顆遙遠的巖石系外行星，比盧克·天行者在《星球大戰(zhàn)》中有兩個太陽家鄉(xiāng)的塔圖因(Tatooine)還要多一個。

Scientists from the Harvard Center for Astrophysics used NASA’s Transiting Exoplanet Satellite Survey (TESS) telescope to spot planet LTT 1445 A b and its three stars.

來自哈佛天體物理中心的科學家們，利用美國宇航局的“過渡外行星衛(wèi)星調(diào)查”(TESS)望遠鏡觀測了LTT 1445 A B行星及其三顆恒星。

“While the planet itself remains in what is probably a stable orbit around its star, that star also orbits, at greater distance, two sibling stars that are locked in close orbit around each other,” explained NASA, in a statement.

美國宇航局在一份聲明中解釋說：“雖然這顆行星本身仍處于一個穩(wěn)定的圍繞它的恒星運行的軌道上，但這顆恒星也在距離較遠的軌道上運行，這兩顆兄弟恒星彼此鎖定在彼此的近軌道上。”

LTT 1445 A b is about 22 light-years from Earth. A light-year measures distance in space and equals 6 trillion miles.

LTT 1445 A B距離地球約22光年。一光年是測量太空中距離的單位，相當于于6萬億英里。

The planet is described as “overheated” by NASA, which notes that LTT 1445 A b is about 1.4 times the size of Earth. LTT 1445 A b’s parent star is LTT 1445 A.

美國宇航局稱這顆行星“過熱”，并指出LTT 1445 A B大約是地球大小的1.4倍，LTT 1445 A B的母星是LTT 1445 A。

“LTT 1445 A b takes only five days to go once around its star – a ‘year’ on this world,” said NASA.

美國國家航空航天局說：“LTT 1445A B只需五天時間就可以繞著它的恒星運行一圈，這是這個世界上的‘一年’。”

“Its scorchingly close orbit helps explain why its surface basks in temperatures on the order of 320 degrees Fahrenheit (160 Celsius) — comparable to a preheated oven.”

“它極近的軌道，有助于解釋為什么它的表面溫度能達到320華氏度(160攝氏度)——這與預(yù)熱過的烤箱相當。”

This is not the first time that a planet with more than one star has been discovered. NASA notes that our nearest exoplanet neighbor, Proxima b, also has three stars in its sky. Proxima b orbits Proxima Centauri located 4.25 light-years from Earth, which in turn orbits Alpha Centauri A and B.

這不是第一次發(fā)現(xiàn)有一顆以上恒星的行星。美國宇航局注意到，我們最近的外行星鄰居，Proxima b，在它的天空中也有三顆恒星。Proxima b繞著比鄰星運行，比鄰星距離地球4.25光年，比鄰星又繞著半人馬座阿爾法星A和b運行。

In 2016, experts from NASA’s Goddard Space Flight Center and San Diego University used the Kepler Space Telescope to spot Kepler-1647 b, a planet with two suns in the Cygnus Constellation.

2016年，來自美國宇航局戈達德太空飛行中心和圣地亞哥大學的專家，利用開普勒太空望遠鏡發(fā)現(xiàn)了開普勒-1647b，這顆行星位于天鵝座，有兩個太陽。