The discovery: A large planet is somehow orbiting a star that should have destroyed it. Key facts: Planet 8 Ursae Minoris b orbits a star some 530 light-years away that is in its death throes. A ...

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...