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 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 ...