Galleries / 11 Great Astro Pics: Winners of the Celestron Photo Contest

For 50 years, artists have had up-close, insider access to the space program. Here are the results.

Our star may seem like a model of constancy, but its surface is violently active, rocked by explosions and sun quakes.

The Apollo program reached the moon 40 years ago today. Here's a look at some of the many technical breakthroughs of that mission.