Changes

The distance light travels in one year.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>  For instance, the [[Andromeda galaxy]] is 2.5 million light years from earth, meaning that light we see from this galaxy has been traveling for over two and a half million  years.<ref>[http://www.solstation.com/x-objects/andromeda.htm]</ref>

The distance light travels in one year ''in vacuo''.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>  For instance, the [[Andromeda galaxy]] is 2.5 million light years from earth, meaning that light we see from this galaxy has been traveling for over two and a half million  years.<ref>[http://www.solstation.com/x-objects/andromeda.htm]</ref>

==References==

==References==

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