Our solar system appears to be home to a huge and unknown dwarf planet-sized asteroid, according to a new study.

A small shard of meteorite that arrived on Earth in 2008 appears to have come from the asteroid, according to researchers who have studied the sample.

The parent asteroid appears to be roughly the size of Ceres, the dwarf planet is the biggest object in the asteroid belt, the researchers say. It also appears to have been formed around water and under some pressure, they found.