Hey everyone, I get it - the faster the object is moving away from me, the more the light it emits moves to the red side of the spectrum. But here's my question: Here on earth, we watch galaxy A, which seems to have a very red light. How can we know it's not "originally" that red, and if it hadn't moved at all, it would've been a bit bluer? Where's that information embedded? As an example, if I sent you a sample of a man talking with an extremely low voice, you wouldn't be able to say it's "originally" medium-pitched, and the reason it's low now is because the man has been moving away from me while recording? Thanks.