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 ...

A single faint infrared source, detected first in 1983 and then again between 2006 and 2007, has emerged as the strongest candidate yet for the hypothetical Planet Nine. Researchers cross-matched two ...