The Gravity Assist Podcast is hosted by NASA's Director of Planetary Science, Jim Green, who each week talks to some of the greatest planetary scientists on the planet, giving a guided tour through ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

In our solar system, the two outermost planets of Uranus and Neptune are something of an oddity. Although both planets are of a similar mass and are similarly distant from the sun, the two are ...

Astronomers may, for the first time, be confirming an exomoon in our universe, much like our moon, but outside our solar ...

You probably already know that gravity can greatly influence cosmic objects as they make their way through space. We see this constantly in how the Sun's gravity causes planets to orbit it. And even ...

Paul M. Sutter is an astrophysicist at SUNY Stony Brook and the Flatiron Institute, host of Ask a Spaceman and Space Radio, and author of How to Die in Space. He contributed this article to ...

Astronomers obsessed with solving the mysteries of dark matter or dark energy should remember: To make a great discovery, sometimes you need to know what you’re looking for. Take Michel Lalande. He ...

Because the solar system's contents formed from a disk around the sun, we would expect the orbits of everything orbiting the sun to keep relatively close to the plane of that disk. However, some don’t ...

Neptune, the farthest known planet in our solar system, is 30 times the distance of the Earth from the Sun. It is orbited by 14 moons, the largest of which is Triton. In Greek mythology Triton was a ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. From where we are in the Solar System, looking out at the distant ...

A tiny moon of Neptune is a real fighter. The little space rock, now named Hippocamp, was probably chipped off a larger moon some 4 billion years ago and repeatedly smashed up and reassembled. Neptune ...