<ul><li>Sirius, the brightest star in the night sky, is not the most luminous star.</li><li>Luminosity refers to a star's intrinsic brightness, and if all stars were equally distant from Earth, Sirius would not be the brightest.</li><li>Sirius appears bright because it is close to Earth, only 8.6 light-years away.</li><li>There are stars in the constellation Canis Major, such as Aludra, Wezen, and Omicron 2, that are believed to be much more luminous than Sirius.</li></ul>

Is Sirius the most luminous star in the sky?

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