The possibility of another Earth-like planet has excited astronomers over the past century, but finding a planet that can support life is like finding a needle in a haystack. Check out all of the most habitable alien planets that we've discovered so far!
Gliese 581g is a possibly habitable planet that was detected by a group of astronomers in 2010 and is nicknamed "Zarmina." This unconfirmed planet orbits a red dwarf star that is only 22 light-years away from Earth! It has a mass of approximately 3.1 to 4.3 times that of the Earth, which puts it under the category of "super-Earth." This planet sits perfectly in the "Goldilocks Zone," so there is a high possibility of liquid water and, therefore, life.