By Kenneth Chang Kenneth Chang has been reporting on dwarf planets and their definitions since Pluto was demoted into that category. A sizable world has been found in a part of the solar system ...

Now, a US-based trio hunting this elusive world has instead stumbled on what appears to be a new dwarf planet in the solar system’s outer reaches and the existence of this new kid on the block could ...

Earth has a newly-discovered neighbor in the solar system. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...