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FOOD FOR THOUGHT 08/20/2008
 

  A light year is the distance that light travels in a vacuum in a period of exactly 365.25 days. One of brightest stars in the night sky is called Sirius, about 8 light years from our solar system. What this means is that it takes about 8 years for light from Sirius to reach the Earth. That is, if one were to look at the star Sirius what one sees is what was there 8 years ago, not what is there now. The farther away we look in distance in space, the farther back we look in time. This, I believe, is one example of what Albert Einstein (with help from others) discovered to be relativity.

  This wondrous, ponderous and relative nature of the universe (in this case, the stars) appropriately serves as some food for thought.


Learn more about the universe.

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