The planets sit in a galaxy 3.8 billion light years away.
The new results explain how two planets in this distant solar system may be positioned just right to create life-friendly conditions.
The space agency has big goals for 2018.
An atmosphere is basically a giant blanket that can protect a planet from a star's barrage of dangerous radiation.
Scientists didn't find aliens in 2017, but here's what they did find.
Knowing what we haven't found can help scientists see what they could still be missing.
The lipstick-shaped satellite has already done incredible science, whatever news Thursday's announcement brings.
A key version of an element could be a sign of life elsewhere.
The device will look for stars like our own sun and examine planets similar to Earth.
It's easier to study planets that are closer to their suns, but how close can you get before it becomes too hot and dry for life to survive?
About 60 tons of space dust hit Earth every day, and it could carry life away.
But don't book your tickets yet—this place is definitely too hot to handle.
Whether you're looking for a tropical getaway or a chance to sit by the ocean, this project has you covered.
It even orbits a star that doesn't spit out deadly rays on a regular basis—cozy!
A hurricane here on Earth is slowing down the search for life on other Earths.
It's about the size of 13 Jupiters smooshed together, which means that for a planet, it's really, really big.
Material ejected from a planet with bacteria or single-cell organisms could reach another within just 100 years.
The ultra-cool dwarf star TRAPPIST-1 has seven roughly Earth-sized planets orbiting it, with three in the star’s “habitable zone.”