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The holy grail of astronomy

Jur Bruijns's picture
By Jur BruijnsOn 20 Jan 2012

The Search for Earth's Twin

Dr. Kaku addresses the following question:
A recently discovered planet named Kepler 22b apparently has a very, very similar composition to Earth, although I don't think they have it exactly figured out yet. What do discoveries like this mean and what is the possibility of many other earth-like planets being out there?

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