This goes against the previous theory, which has long suggested that Nereid is actually an object captured from the Kuiper ...

Astronomers believe Triton may not have originally formed around Neptune.

Far from the Sun’s heat, orbiting the outer planets of the solar system, are moons with oceans of liquid water beneath their frozen surfaces. Keith Cooper finds out how planetary scientists ...

Moons may seem like quiet companions to the planets, but many of them are worlds every bit as fascinating as the planets themselves. Some are covered in oceans, some erupt with lava, and others ...

Even at a glance, the planets in our solar system are wildly diverse. Huge and small, airless and densely packed with ...