Most stars in the cosmos are small, cool red dwarfs, yet the only intelligent life we know orbits a relatively rare yellow dwarf under a blue sky. That mismatch is at the heart of the “red sky paradox ...

A decade ago, we spotted an exoplanet that could be the most habitable world yet discovered. Now we're about to find out if it has the last crucial ingredient it needs to support life SEVEN ...

For generations, artists and science-fiction writers have imagined alien landscapes beneath twin sunsets. The image became iconic in popular culture long before astronomers confirmed that planets ...