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The Holy Grail of Planetary Astronomy: The Search for Earth’s Twin

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Every Wednesday, Michio Kaku will be answering reader questions about physics and futuristic science. If you have a question for Dr. Kaku, just post it in the comments section below and check back on Wednesdays to see if he answers it.

Today, 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?

Watch Dr. Kaku’s response here:

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