Asked Nov 11, 2019
if gas cloud in the image crosses in front of the star, and the gas cloud and star have different radial velocities, what would the combined spectrum of the gas cloud and the star look like

Expert Answer

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A gas cloud has a lot of hydrogen in it, which abosrbs the UV light emitted by a star. When UV light falls on a gas cloud, the electrons gets excited in the atoms of the gas and jumps down a series of discrete energy levels. Every time a electron jumps, it gives a little bit of light. When an eletron makes that drop, it emits a...

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