A Hubble image of a pair of overlapping galaxies. They look as if they're colliding, but they are actually separated by tens of millions of light-years.
If you could stand on the surface of the moon during a total lunar eclipse, you'd be bathed in an eerie red glow. Here are the five best things to see.
All 147 negatives of the 1882 Venus transit had lain patiently on a high-up, corner shelf at Lick Observatory for 120 years. Two astronomers decided to make a movie.
Sun-observing SOHO spacecraft has caught sight of Venus prior to spectacular transit - last one in our lifetimes - on June 5-6. See the historic photos.