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What is absolute magnitude?

A. The measure of the amount of light given off by a star.
B. The measure of actual brightness of a star.
C. The size of the star.
D. The measure of how bring a star appears from Earth.

1 answer

B. The measure of actual brightness of a star.

Absolute magnitude is a measure of the intrinsic brightness of a celestial object, specifically how bright a star would appear if it were located at a standard distance of 10 parsecs (about 32.6 light years) from Earth.