How to use emission or absorption lines to determine composition of a distant object?
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How can we use emission or absorption lines to determine the chemical composition of a distant object? It's an astronomy question I'm having a hard time with.
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Answer:
Spectroscopes are attached to telescopes to separate the spectral lines. Then, the wavelengths and intensities indicate the elements and amount of the elements in that object (star, or in some cases, planet atmosphere. You have to have an idea of a prism or diffraction grating being able to separate the wavelengths of the light into their constituents, and that specific elements emit or absorb light of particular set of wavelengths.
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