Rocks collected from the Moon’s far side suggest the early Solar System endured a long decline in asteroid impacts rather ...

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

We have an idea of what the solar system's past was like: It was violent and chaotic. However, we are still studying how violent it was. Current models suggest that at some point after their formation ...

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

The outer planets of the solar system are swarmed by ice-wrapped moons. Some of these, such as Saturn's moon Enceladus, are known to have oceans of liquid water between the ice shell and the rocky ...

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

A solar eclipse is a rare, visually striking phenomenon. The Moon passes between Earth and the Sun, temporarily hiding our star – a geometrical alignment spanning millions of miles. A partial solar ...

Neptune's moon and ring system stand out among the giant planets because of the strange imbalance between its one very large ...

Moons created from massive collisions the way Earth’s may have been, are a rarity in the universe, suggests a new study. Our Moon probably formed when a Mars-sized object slammed into the newly-formed ...