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?