TRAPPIST-1 is a red dwarf star lying about 40.7 light-years away. It is of particular interest because it has seven earth-like planets orbitin…

It is not often that all the planets in the Solar System other than ours are lined up across the night sky for us to see. The show is in progr…

Our ancestors noticed that among the “fixed stars”, which remained in unchanging patterns, there were five “wandering stars”, or planets, visi…