The TRAPPIST-1 system centers around an ultra-cool red dwarf star just 39 light-years from Earth.
It is famous for hosting seven temperate terrestrial planets, three of which reside squarely in the habitable zone. Because the star is so small, all seven planets orbit closer to it than Mercury does to our Sun!
An ultra-cool red dwarf star barely larger than Jupiter. It is so dim that its habitable zone is incredibly close to the star.
A hellish, tidally locked world baked by the red dwarf. It likely features a global magma ocean on its dayside.
The heaviest planet in the system. It likely has a Venus-like atmosphere, crushed by extreme pressure and toxic clouds.
Sitting right on the inner edge of the habitable zone, this small rocky world might possess a thin, breathable atmosphere.
The prime candidate for life. It sits perfectly in the habitable zone and is highly likely to host massive liquid oceans.
A water-rich world near the outer edge of the habitable zone. Its oceans might be covered in a thick crust of ice.
A massive frozen sphere. Because the planets are so close together, the neighboring worlds would appear larger than the moon in its sky.
The outermost planet. It is a tiny, frozen snowball drifting in the dim red light of its distant star.