January 8, 2013

A Million Billion Billion Planets in Universe

Ethan Siegel, ScienceBlogs

AP Photo

It wasn’t all that long ago — back when I was a boy — that the only planets we knew of were the ones in our own Solar System. The rocky planets, our four gas giants, and the moons, asteroids, comets, and kuiper belt objects (which was only Pluto and Charon at the time) were all that we knew of.

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TAGGED: Exoplanet