I think that an elements spectrum is called it's fingerprint because like a fingerprint every spectrum is atleast slightly different and it is its own special thing. This helps us to determine which element is which, because none of them are identical. When atoms leave their ground state and enter their "excited state" they return back to their original ground state. When this happens light is omitted and depending on the elements electrons different colors.
When an element is changing from it's ground state to an excited state the electrons absorb energy and move to higher energy levels.
Helium was originally discovered in the sun, before on earth.
A red shift happens when light seen coming from an objects are increased in wavelengths, or shifted to the red side of the spectrum. A blue shift happens when there is a decrease in the wavelength and it becomes shifted towards the blue side of the spectum. Because of the increasing wavelengths in red shifts the distances of the objects are becoming larger and this is creating the universe to expand.
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