Spectroscopy Is How We See Stars
What is Spectroscopy?
Spectroscopy Helps Astronomers
How Do We Know What Stars Are Made Of?
Stars Are Mostly Made of Hydrogen
How Do We Identify The Elements in a Star?
2. Make sure that it matches up with the star's spectral lines (so both look like an absorption spectrum). If the spectral lines match up, then that element is part of the star. If not, then try again because it is not part of the star.
3. Repeat until all elements have been located.