Something's got the Kuiper belt's rocks off, and there's a scramble to find it.
Life as we know it probably wouldn't exist.
Our best guess for what it would take to get to planets that are really, really far away.
InSight is blasting off this week.
Also in space: A neighborhood of black holes, a new (and old) reason to study Venus' clouds, and the end of the ...
Our solar system's largest planet is a master of disguise.
Desperate times inspire desperate measures.