posted on Nov, 12 2002 @ 06:38 AM
Originally posted by Cammo Dude:
"radio telescopes can see many light years away of course. Then why do we get info from those places so fast? *I know this may be a very stupid
as one of my lecturers used to say: "no questions is stupid, just some of the answers you get to them." FreeMason has already answered your
question but perhaps i can cover it a little bit more ... elloquently?
take one person (A) and have him stand on one edge of a field. take another person (B) and stand them on the other side of the field. A shouts to B,
but it takes time 't' for the sound to travel from A to B, and hence for B to hear it.
what am i saying? that sound travels at a finite speed, and as such you can hear sound NOW that was produced sometime in the past. the same goes for
radio / light / any e-m radiation detected from space.
so, your radio telescope for example can pick up radio waves produced by stellar bodies many many light years away, but it has also taken a great deal
of time for those radio waves to reach Earth. hence, astronomers and astrophysicists often talk of 'looking back in time' with their