It does work in both directions. It's just that everything that's fairly distant is moving away from us (do we have bad breath?), and the farther it is, the faster it's going, so the amount of red shift is really useful for astronomers who are trying to figure out how old/distant what we're seeing is.
Afaik, there's nothing in astronomy where blue shift matters.
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zvi and
Re: I recall hearing this as "red shift",
Date: 2004-07-31 12:06 pm (UTC)Afaik, there's nothing in astronomy where blue shift matters.