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

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.

The Solar System is not just a flat plane of planets orbiting the Sun. Above, below, and around it lie the heliosphere, Oort ...

The Solar System’s future over the next five billion years will be shaped by the slow but dramatic evolution of the Sun. As ...

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

Spiral Galaxy from Kirkland et al. CREDIT Chris Kirkland and colleagues. A new study of zircon crystals from two of Earth’s oldest continents indicates that the formation of Earth’s continental crust ...

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

Oh, we humans do love a cleanly defined boundary, don’t we? They make things easier, after all. If we’re trying to categorize something, knowing what labeled bin to put it in is handy. If we’re ...

Approximately 4.5 billion years ago, a cold cloud of gas and dust buried deep in one of the Milky Way galaxy’s spiral arms started to collapse. From there, gravity worked its magic. The cloud began to ...