Wednesday, August 24, 2011

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Meet the Solar System's Dwarf Planets

by Mike Wall, SPACE.com Senior Writer

For three-quarters of a century, schoolkids learned that our solar system has nine planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. But things changed nearly five years ago today.

Cosmic Crashes May Give Habitable Planets the Boot

by SPACE.com Staff

Long-ago collisions between clouds of gas and dust could explain why many alien solar systems have planets with strange, highly tilted orbits - and why habitable worlds may be rare in the universe, a new study suggests.

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