To support alien life, a planet doesn’t have to be exactly like Earth, but it does need a few key ingredients. First, it should orbit its star at the right distance, where temperatures allow liquid ...

A decade ago, we spotted an exoplanet that could be the most habitable world yet discovered. Now we're about to find out if ...

They’ve obscured alien worlds from us for years, but clouds could turn out to be where the first hints of extraterrestrial ...