"It's just completely bizarre that we should have two planets the same size but opposite ends of the habitability spectrum."
The planet is likely the densest Earth-sized planet ever found.
"This is an enormous challenge," Hawking said in the film. "To leave Earth will take a global approach and everyone should join in."
The spacecraft has spotted almost three-quarters of the alien planets scientists have identified to date.
The dust could be evidence of evolving infant exoplanets.
Although the flare lasted just 10 seconds, it made the star appear about 1,000 times brighter than usual.
The numbers contradict everything we know about how moons form.
An intriguing feature of its orbit ties this telescope's destiny to a lunar schedule.
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.