How can the presence of an element in a distant star detected ?

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How can the presence of an element in a distant star detected ?..

Answer / bob

Spectroscopy is correct. Certain elements emit light at a
certain wavelength (color). The combination of wavelengths
serves as a signature for an element.

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How can the presence of an element in a distant star detected ?..

Answer / sanju

By means of Spectroscope

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