What do we depend on spectroscopy to know about in astrophysics? Or, without spectroscopy, what would remain unknown to us? I want to know how important it is.
My wife is studying spectroscopy in chemistry, and we began to discuss it and I mentioned that spectroscopy gives us the composition of heavenly bodies, as well as their radial velocities. From this we can infer much about the origins of the universe, e.g. hydrogen-rich stars are older and the universe is expanding. Are there other ways we could know about these phenomena without spectroscopy? Are there other phenomena or conclusions that we could not make without it?
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