Quote:
Originally Posted by Sephiroth
First, though - a correction: Blue shift occurs when an object is approaching an observer, not receding. Local galaxies might be approaching but expansion of the universe outside any locality is generally accepted due to the red shift observations.
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You're absolutely correct. My brain skipping ahead and leaving the fingers behind! Thank you for correcting
---------- Post added at 21:58 ---------- Previous post was at 21:56 ----------
Quote:
Originally Posted by GrimUpNorth
If the universe is expanding, and everything is moving away from everything else, how can we be on a collision course wth Andromeda?
I've watched every episode of How The Universe Works on Discovery and still don't understand it.
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If that was all it that was needed to understand the universe, we would all be experts!