Speculation about extraterrestrial life has rarely been far from public debate, and one Harvard researcher continues to push ...

From 'Andor' and 'Expedition 33', to streamers and artists, here's the pop culture io9 is thankful for this year.

Jupiter's moon Io may host alien life in protected lava tubes. Now, Avi Loeb claims the anomalous interstellar object ...

Across the outer solar system, some of the tiniest icy satellites are emerging as unlikely candidates for extreme internal oceans, where water may simmer or even boil beneath frozen crusts. Instead of ...

An essential amino acid that is mistakenly believed to cause drowsiness after eating turkey has been found in an asteroid for the first time, giving scientists clues to the origin of life on Earth.