Spectroscopes are devices that take the light emitted from objects and split it up into their component colours. Every element has a different signature spectrum, and thus the spectroscope allows the observer to define what elements the object is composed of.
Spectroscopy was first used in astronomy in the early 1860s. One of its first uses was to determine the elements that comprise the sun. Star spectroscopes can allow a user to determine the composition of a celestial object, its motion, de...
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