Spectacular Spectrums

By Sophia Figueroa and Anthony Fastiggi

How are they spectacular?

Spectroscopy is the analysis of light spectra and the way in which light interacts with matter. This is useful because it will help us identify what is in the star. The spectra is like a fingerprint. No one has the same fingerprint, so no star has the same spectra. To conduct spectroscopy, you need a spectrograph. A spectrograph is an instrument which disperses the incoming light and measures the intensity of radiation at each wavelength.The analysis of the radiation (light) coming from a star will identify the elements in that star. This is useful to astronomers because it can help them identify what stars are made of. For example, based on spectroscopy, an astronomer can tell if a star is made of Lithium or Helium.