Captured last week after sunset on a Chilean autumn night, an exceptional airglow floods this allsky view from Las Campanas Observatory.

This image is not blurry. It shows in clear detail that the largest satellite galaxy to our Milky Way, the Large Cloud of Magellan (LMC), rotates

Four hundred years ago today (May 15, 1618) Johannes Kepler discovered the simple mathematical rule governing the orbits of the solar system's planets, now recognized as Kepler's Third Law of planetary motion.

What lies at the bottom of Hyperion's strange craters?

Why does a volcanic eruption sometimes create lightning?

A recent informal poll found that astronomers don't yet have a good collective noun for a group of black holes, but they need one.

This pretty cosmic cloud lies some 1,500 light-years away, it shape and color reminiscent of a blue robin's egg.

Large galaxies grow by eating small ones. Even our own galaxy practices galactic cannibalism, absorbing small galaxies that get too close and are captured by the Milky Way's gravity.

How was the unusual Red Rectangle nebula created?

How far can you see?