What dwarf planet is the biggest asteroid belt object between Mars and Jupiter, and was previously thought to be an asteroid?

Ceres was discovered in 1801 and was originally classified as a planet. However, in the 1850s, it was downgraded to an asteroid after the discovery of over 20 additional objects with similar trajectories. In 2006, it was finally classified as a dwarf planet due to its diameter of 580 miles, making it the only asteroid big enough to be rounded by its own gravity.

Asked by Vasilii Kulev · Last updated 4 years ago · 11.9K views · SOURCE