Eli5: Why do planets look like stars?
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Planets reflect light from the Sun. This light will have the same spectrum as sunlight with modification due to absorption by atoms on its surface or atmosphere.
This modified spectrum of light leads to the observation that Mars appears reddish and Saturn a creamy yellow. Stars emit light that covers the visible spectrum of light.
Hotter stars have a spectrum skewed towards the shorter wavelength end of the spectrum, so they appear bluish. Cooler stars have a spectrum skewed towards the red end, so they have a reddish colour
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