Comments by "GH1618" (@GH-oi2jf) on "Why Can't We See Evidence of Alien Life? | Documentary" video.

  1. “Are we alone in the universe?” is the opening statement. Consider that practically everything in the universe is vastly far away from Earth in both distance and time. Only one large galaxy outside our own, M31, is close enough to see with the naked eye. It is about two and a half million light years away. At that distance we can resolve individual stars and observe some of their characteristics. But practically everything in the universe is much farther away than that. For galaxies outside the local group, we can detect supernovae, but not much finer detail about the stars. Detecting planets, and radio signals from planets, is not possible beyond some distance, so nearly all the universe is beyond the range within which we can detect civilizations. Thus the initial question is moot.
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