Astronomy Picture of the Day

Comet Schwassmann-Wachmann 3 Passes the Earth

A Five Quasar Gravitational Lens

NGC 1579: Trifid of the North

Omega Centauri

Gamma-Ray Moon

GRO J1655-40: Evidence for a Spinning Black Hole

Ancient Craters on Saturn's Rhea

Simulated Gamma-ray Sky

Reflections on NGC 6188

IC 443: Supernova Remnant and Neutron Star

Gamma-Ray Earth