NASA's Chandra X-ray Observatory captures the first-ever X-ray of an exoplanet passing in front of its parent star in a system that is 63 light-years from Earth.
Astronomers have made a crude thermal map of an extrasolar world they cannot yet see, confirming that violent winds rapidly whip around the planet.
Evidence that plant life was a primary force that shaped Earth's surface is laid out in a new issue of Nature Geoscience. Because of that, the chance we'll find a similar world with a surface like our planet's is very small.
Two studies suggest distant worlds have atmospheres with water, but some aren't places you'd want to visit anytime soon.
NASA confirms the discovery of an Earth-sized planet that may have potential for life, but its sun is dimmer than ours. Here's what an evening stroll on a beach on Kepler-186f might be like.
You should't feel as alone today as you did yesterday. NASA says it has confirmed the existence of 715 new exoplanets beyond our solar system, many of them not that different from Earth in terms of size.
Astronomers locate a rare Earth-size rocky planet outside of our solar system, but it's not very hospitable.
Kepler-186f orbits an M dwarf star in the constellation Cygnus. More importantly, it's the first confirmed Earth-size, potentially habitable planet elsewhere in the universe.
The space agency is giving up on restoring its planet-hunting spacecraft to full operational capability, but that doesn't mean the mission is over just yet.
You may think this planet is overpopulated or you may just be sick of the partisan politics. In either case, HD 40307g is an attractive getaway.