Astronomy Picture of the Day

Slightly Beneath Saturn's Ring Plane

Unusual Bright Soil on Mars

The Crown of the Sun

Vanishing Umbra

Molecular Cloud Barnard 68

Mars: The View from HiRISE

A Sun Halo over Utah

Binary Black Hole in 3C 75

Star Cluster Dreams

Smoke from the Cigar Galaxy

Galaxy Wars: M81 versus M82

A Solar Prominence from SOHO