Why are TRAPPIST-1 planets unique? I mean they don't have anything special except they are orbiting a red dwarf. We even don't know if water is there. Why are they so special? -
![TRAPPIST-1 - A depiction of the TRAPPIST-1 system, a collection of seven terrestrial planets hugging close to a small ultracool red dwarf star. TRAPPIST-1 - A depiction of the TRAPPIST-1 system, a collection of seven terrestrial planets hugging close to a small ultracool red dwarf star.](https://user-images.githubusercontent.com/43260601/154181767-d7598083-0409-42ae-86b6-e582b3a11eb0.png)
TRAPPIST-1 - A depiction of the TRAPPIST-1 system, a collection of seven terrestrial planets hugging close to a small ultracool red dwarf star.
![File:Artist's impression of the ultracool dwarf star TRAPPIST-1 from the surface of one of its planets.jpg - Wikimedia Commons File:Artist's impression of the ultracool dwarf star TRAPPIST-1 from the surface of one of its planets.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/Artist%E2%80%99s_impression_of_the_ultracool_dwarf_star_TRAPPIST-1_from_the_surface_of_one_of_its_planets.jpg/424px-Artist%E2%80%99s_impression_of_the_ultracool_dwarf_star_TRAPPIST-1_from_the_surface_of_one_of_its_planets.jpg?20160807101355)