In this way, Edwin Hubble worked out the distances to nine different galaxies. We now know that our galaxy is only one of some hundred thousand million that can be seen using modern telescopes, each galaxy itself containing some hundred thousand million stars.
Stephen HawkingAny physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it.
Stephen HawkingIf aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.
Stephen Hawking