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Brightness is a function of a stars luminosity as observed from Earth.

So our Sun is the brightest.

Vega has an apparent magnitude of: 0.03

Betelgeuse has an apparent magnitude of 0.42

So, in apparent magnitude, Vega is brighter.

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โˆ™ 2012-03-31 14:51:51
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Q: Is Vega or Betelgeuse the brightest star?
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