Uranus, Neptune, Pluto. Pluto was last and least of them. An icy dwarf only half the size of the United States, it was on ...

The hidden moons were discovered orbiting Uranus and Neptune, and the discovery brings the moon counts for these planets to 28 and 16, respectively. The discovery of these hidden moons is both ...

Superior planets (those that lie further from the Sun than us: Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto) can reach an elongation of 180 degrees, which is called opposition; that is, they ...