The moon performed a cosmic ballet with Mars this week.

A NASA satellite has spotted frozen "kidney beans" on Mars' sand dunes trapped in place until springtime. Photographing them ...

January’s full moon, the “Wolf Moon,” rose alongside Mars at its brightest, occulting it for a short period as seen from ...

From arachnid-like formations and mysterious blobs to an underground ocean and a giant volcano, here are our 10 favorite ...