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The
absolute magnitude is the magnitude the stars would have if viewed from a
distance of 10 parsecs or some 32.6 light years. Obviously, Deneb is
intrinsically very bright to make this list from its greater distance. Rigel, of
nearly the same absolute magnitude, but closer, stands even higher in the list.
Note that most of these distances are really nearby, on a cosmic scale, and that
they are generally uncertain by at least 20%. All stars are variable to some
extent; those which are visibly variable are marked with a "v".
What are apparent and absolute magnitudes? Apparent is how bright the appear to
us in the sky...
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