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He found that the shorter the wavelength the greater the angle of refraction so that a spectrum of light is produced from red through to violet. Stellar Spectroscopy is the study of the spectra of starlight. It is a very powerful tool that enables astrophysicists to infer many physical and chemical properties of stars and classify them into a logical sequence. In order to understand how spectroscopy can be a useful tool to astrophysicist we need to describe the different kinds of spectra that are observed and explain how they arise. Rule 1 A hot opaque solid, liquid or gas which is under high pressure will emit a continuous spectrum .