Eris is more massive than Pluto but has a smaller volume. It has only one known Moon, called Dysnomia, and it orbits the Sun in just over 559 years. At its closest approach, Eris is 5.7 billion ...

The first flight of Eris, the first Australian-designed and built rocket, set to launch no earlier than March 15. Australian company Gilmour Space has announced the launch window for its first ...

Planets orbit the Sun in roughly circular paths, and moons orbit around planets. Asteroids and comets move in paths which are more oval in shape. The Sun’s gravity holds all of these objects ...