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29 January, 07:12

What determines the brightness of a star in the sky?

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  1. 29 January, 07:33
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    how far it is in light years
  2. 29 January, 09:54
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    A glance at the night sky above Earth shows that some stars are much brighter than others ... Astronomers define star brightness in terms of apparent magnitude - how bright the star appears from Earth - and absolute magnitude - how bright the star appears at a standard distance of 32.6 light-years, or 10 parsecs.
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