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Luminosity has do with brightness of a star. It's essentially the power of the star, or how light is being emitted from the surface. About how much brighter is Antares than the Sun

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The brightness of Antares at visual wavelengths is about 10,000 times that of the Sun, but because the star radiates a considerable part of its energy in the infrared part of the spectrum, the true bolometric luminosity is around 100,000 times that of the Sun.
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