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Space Forum / Astronomy / August 2006Back in time?
How do we know that looking far away billions of light years is looking back in time. Maybe what we are looking at happened after we did. Then wouldn't we be looking ahead in time? We always assume that everything far away happened way long ago.  SignatureLinux is just a fancy name for Windows blocker. Claude Hopper > How do we know that looking far away billions of light years is looking > back in time. Maybe what we are looking at happened after we did. Then > wouldn't we be looking ahead in time? We always assume that everything > far away happened way long ago. How could light get here before the event that produces it? > How do we know that looking far away billions of light years is looking > back in time. Maybe what we are looking at happened after we did. Then > wouldn't we be looking ahead in time? We always assume that everything > far away happened way long ago. This is the type of post that makes me want to choke the original poster. Matty-o >> How do we know that looking far away billions of light years is looking >> back in time. Maybe what we are looking at happened after we did. Then [quoted text clipped - 4 lines] > > Matty-o 'Lo Matty-o -- You are welcome to feel gratified by the fact that your "want" is widespread. And yet... there are those who feel deeply saddened by the fact that your attitude may be what's wrong with this world. happy days and... starry starry nights! SignatureIndelibly yours, Paine http://www.painellsworth.net http://www.savethechildren.org > How do we know that looking far away billions of light years is looking > back in time. Maybe what we are looking at happened after we did. Then > wouldn't we be looking ahead in time? We always assume that everything > far away happened way long ago. As far as we can tell, light travels at a constant finite speed in vaccuum. Before you can see the event of interest the light has to travel from the location of the event to where you are observing it. You see the Sun as it was around eight minutes ago. When you hold your hand about a foot from your face the light reaches your eye about a nano second after it leaves your hand. Klazmon. |
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