Tyson: Galileo was a good Catholic, but he didn't believe religion was where you went to for science. He says that being religious didn't mean you couldn't be scientific; there are many famous scientists who had been priests or even monks. We have a limited number of autographed copies of David Sobel's latest book, The Planets. If you can convince us why you might deserve one of these autographed copies, tell us on our website, startalkradio.net. Give us a call at 1-877-5-STARTALK.