【正文】
ht that the galaxy, EGSzs81, formed more than 13 billion years ago at a time when the universe was only five percent of its present age. 科學家使用位于夏威夷的凱克天文臺的望遠鏡發(fā)現(xiàn)了新星系,并將這個星系命名為 EGSzs81。天文學家稱,這是至今為止發(fā)現(xiàn)的最接近地球的“孿生星球”,跟地球的相似指數(shù)為 ,并且有可能擁有大氣層和流動水。 這顆系外行星編號 Kepler 452b,其直徑約為地球的 ,與恒星之間的距離與日 地距離相近。 Lesson 22 Discoveries學案 一、課外知識補充 NASA on 23rd,July announced the discovery of Kepler452b, the most Earthlike planet ever found. Located 1,400 lightyears from our pla, NASA called it earth , because because it’s thefirst pla discovered in the habitable zone of a G star similar to our sun. 7月