Lunar crater Endymion normally sits close to the northeastern limb. Tonight, libration has brought it into clearer view.

James Van Allen discovered the two Earth-circling radiation belts that bear his name in 1958. The discovery, based on data from Explorer 1 (the first U.S. satellite), Explorer 3, and Pioneer 3, was ...

In August 1960, NASA launched its first communications satellite, Echo 1. Fifty years later, NASA has achieved another first by placing the ARTEMIS-P1 spacecraft into a unique orbit behind the moon, ...

The combination of the slow rocking back and forth of the moon called libration brings into view three lunar maria or "seas" that are normally hidden around the backside - Mare Humboldtianum, M.

In my most recent article for Scientific American, I may have lied to you. In my defense, I didn’t so much lie as maybe oversimplify a tiny bit. I wrote that because of the effects of the tidal force ...

In August 1960, NASA launched its first communications satellite, Echo 1. Fifty years later, NASA has achieved another first by placing the ARTEMIS-P1 spacecraft into a unique orbit behind the moon, ...