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Working with spectral behaviour of objects - Stars

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How can the temperature, composition and motion of an object be determined from its light spectrum?

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We can use a star's light to determine the star's temperature,composition and motion. Astronomers analyze a star's light by looking at it's intensity at different wavelengths. Also known as Wien's displacement law (developed by German physicist Wilhelm Wien) links the wavelength at which the most energy is given out by an object and its temperature. Astronomers put filters of different ...

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