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BrokeAstronomer

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  1. Oh man, astronomers love to acquire spectra. It is one of, if not the best way to learn about an object. It's chemical composition, temperature, radial velocity, redshift, rotation ..we can even learn about the composition of gas clouds along the line-of-sight to a distant object. Once we have an object's spectrum, we compare it to a theoretical spectrum at rest and use the Doppler equation to determine it's redshift. It sounds absurd, but if an object has been identified, there's a good chance it's spectrum was acquired and someone estimated it's redshift. P.S. I'm new here and I like to ramble.
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