Are we alone in space? Is the Earth the only planet that has life? 【小题1】 Now we may get one step closer to the answers.

On Feb. 22nd, NASA said they found seven Earth-like planets. 【小题2】 The planets go around a dwarf star（矮星）called Trappist-1. It is much smaller and cooler than our sun. They are about 39 light-years（光年）from the Earth. 【小题3】 But scientists say it’s a little close.

【小题4】 If you lived on one of them, you could possibly see the clouds around the next planet. More importantly, three of the planets are at the perfect distance（距离）from the Sun. 【小题5】 If there is liquid water（液态水）, there could be life.

For scientists, the finding is not an end. Next, they will try to find out if the planets have atmospheres（大气层）.