Sunday, April 12, 2009

Looking for a ghost planet

Was there once a planet orbiting near Earth - a world which crashed into ours, with the Moon forming from the collision? It's not a widely supported theory, but it's intriguing enough that NASA's twin STEREO probes are taking a look. The hypothesized planet Theia would have existed at an Earth-Sun Lagrange point,and it should have left asteroid-sized traces of itself. What will we find....?

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