system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The discovery of 7 Earth-like planets. TRAPPIST-1 is a star 39 light years away. And scientists found 7 planets the size(ish) of Earth orbiting it? Or am I completely lost? What am I missing here?
gpt
You got it right.  7 planets roughly Earth-sized (+ or - about 25%), 3 of them in what they think would be the habitable zone for life like we have on Earth.  The star is an ultra-cool red dwarf, which is about 8-11% the size of our Sun, and has a surface temperature about 41% that of the Sun.

Because of how close they are to their star, the one furthest from the star has a year about as long as 20 of our days and the rest are shorter than that.  Since they are so close, they expect all of them to be tidally locked, meaning the same side is always facing the star, similar to how our Moon always has the same side facing us.