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35 Words that Change History
) a measure of the distance,
, of a celestial object too far away to show measurable parallax. It is given by
= 5 log(
is its apparent magnitude (corrected for interstellar absorption) and
is its absolute magnitude
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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