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Electromagnetic (EM) waves, particularly in the form of light, are used in spectroscopy to determine the composition of distant stars and planets. When light from these celestial bodies passes through their atmospheres or is emitted from their surfaces, it interacts with different elements, producing unique absorption or emission spectra. By analyzing these spectral lines, scientists can identify the specific elements present, as each element has distinct signatures in the EM spectrum. This technique allows astronomers to study the chemical makeup and physical conditions of stars and planetary atmospheres across vast distances.

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1mo ago

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