The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Quaoar is a dwarf planet in the Kuiper belt. It was discovered by astronomers Michael Brown and Chad Trujillo in 2002. Since that time, studies have shown it to be approximately 1,110 km in ...

On that fateful January day, the team of Mike Brown, Chad Trujillo, and David Rabinowitz discovered Eris.The team had discovered two objects in the years before – Sedna and Quaoar – cold ...

Astronomers are puzzled by a ring around the icy dwarf planet Quaoar that is much farther from its parent body than thought possible ...