Newly discovered dwarf planet could challenge what we know about our solar system

Astronomers have discovered a second icy world orbiting in a slice of the solar system where, according to their best understanding, there should have been none.

“They’re in no man’s land,” Scott S. Sheppard, of the Carnegie Institution for Science in Washington, said of the objects, which orbit far beyond the planets and even the ring of icy debris beyond Neptune known as the Kuiper belt.