美国国家航空航天局近日宣布,科学家们在距离地球约40光年外的一颗恒星周围发现了7颗地球大小的行星,其中,3颗行星中可能会存在液态水,甚至生命。这7颗类地行星围绕着冷却的矮星“TRAP-PIST-1”公转。“TRAPPIST-1”是宝瓶座星群中一颗距地球39光年的矮星。从太空的意义上来说,这些行星距离地球已经非常近了,但是以一架常规的火箭速度来计算,它将飞行4 400万年才能到目的地。因此,人类能够立刻到那里一探究竟的机会是很渺茫的。不过接下来,天文学家们将会继续探索这些宜居行星上是否存在大气, NASA recently announced that scientists have found seven planet-sized planets around a star about 40 light-years away from Earth, of which three planets may have liquid water or even life. These seven Earth-like planets revolve around the cooled dwarf “TRAP-PIST-1”. “TRAPPIST-1 ” is a 38-year-old dwarf star in the constellation Aquarius. In space, these planets are very close to Earth, but at a conventional rocket speed, they will fly 44 million years to reach their destination. Therefore, it is very slim to see where human beings can immediately find out. But then, astronomers will continue to explore the existence of these livable planets on the atmosphere,