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 ...

Looking for a sky event this week? Check out our full Sky This Week column. May 25: Three planets after sunset Tonight, let's ...

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 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, ...

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 ...

First, authors present the dynamical models and pursuit-evasion orbits used in this paper In this paper, the Earth-Moon rotating frame (EMR) and the circular restricted three body problem (CR3BP) is ...

There's something strange going on below the surface of Saturn's Death Star-looking moon Mimas, a new study suggests. Mimas' rotation and its orbit around Saturn make the moon look like it's rocking ...

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, ...