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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
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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