Three Potential New Dwarf Planets Discovered Near Pluto

The Kuiper Belt, the vast asteroid belt of ice and rock that lies beyond Neptune, is home to three objects big enough to be considered dwarf planets: Haumea, Makemake, and our old friend Pluto. And now, we might have found three more. » 8/08/11 8:00am 8/08/11 8:00am

A complete guide to the planets' birthdays

Last week saw Neptune Day, the first anniversary - in Neptune years - of the planet's discovery on September 23, 1846. That got us thinking: what are the "birthdays" for all the other planets? Here's a handy, mildly insane guide. » 7/17/11 7:00am 7/17/11 7:00am