Some measure hundreds of kilometres across. The largest object is the asteroid belt is the dwarf planet Ceres, which is 950km in diameter (that's about the same the length as Great Britain).

This is both the largest sample of dwarf galaxies with active black holes ever seen and the largest haul of elusive intermediate-mass black holes ever collected. The data could help scientists ...

Pluto, discovered in 1930, was once considered the ninth planet in our solar system. In 2006, the International Astronomical Union reclassified Pluto as a dwarf planet because it doesn't meet all ...