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Old 01-24-2003, 05:40 PM
Chronos Chronos is offline
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Join Date: Jan 2000
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May I toot my own horn for a bit?
Quasars
Astronomical distances

As for the redshift, suppose that we know that the spectrum of hydrogen looks something like this

Red ..................|..|.....||...|....|.. Blue

And now suppose that we see something with a spectrum that looks like this

Red ...|..|.....||...|....|................. Blue

It's safe to say that that's probably the same spectrum, but shifted towards the red. Note, by the way, that this is not shifted "slightly", like Grey said, in the case of a quasar, but it is definitely shifted, and it's still recognizable.