A High Cliff on Comet Churyumov Gerasimenko

This high cliff occurs not on a planet, not on a moon, but on a comet.

12h

Messier 101

Big, beautiful spiral galaxy M101 is one of the last entries in

1d

Great Refractor and Lunar Eclipse

Great Refractor and Lunar Eclipse

2d

At the Shadow's Edge

Shaped like a cone tapering into space, the Earth's dark

3d

Pleiades: The Seven Sisters Star Cluster

Have you ever seen the Pleiades star cluster?

4d

The Sun in X rays from NuSTAR

Why are the regions above sunspots so hot?

5d

Lunar Eclipse over a Skyscraper

Why is the Moon on top of this building?

6d

Introducing Comet Leonard

Here comes Comet Leonard.

1w

An Almost Total Lunar Eclipse

Predawn hours of November 19 found the Moon

2w

NGC 281: Starless with Stars

In visible light the stars have been removed from this narrow-band image

2w