How did the first solids that made up planets, moons and asteroids form from the "hot soup" that characterized our solar ...

Ganymede, Jupiter's largest moon, possesses planet-like dimensions and a hidden ocean. This moon is larger than Mercury and ...

A distant 'exomoon' the size of Jupiter is changing how we think about the cosmos.

A massive object appears to be circling a brown dwarf in the CD-35 2722 system, but calling it a moon is not straightforward.

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. An object has been discovered orbiting the sun far beyond ...

Our moon is closer in size to Earth than any other moon in the solar system is to its associated planet, however it is far from the largest moon around.

A Jupiter-mass object orbiting a brown dwarf could become the first confirmed moon beyond our Solar System.

I find the outer reaches of our solar system fascinating. It’s a place that we know very little about considering how relatively close it is – even its size is up for debate. It’s littered with icy ...

Based on the composition of gases spewed by the icy space rock, researchers estimate that our guest might be up to 12 billion ...

Researchers at Caltech and Sophia Space, a start-up, have developed a technology using solar power to prevent computer ...

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our solar system that could support life in some form.