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Level 16

Astronomical Distances and Brightness


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Parallax
An apparent change of an object against a distant background
Arcsecond
The measurement in which parallax is most commonly displayed
Parsec (pc)
A unit of distance favoured by astronomers
Luminosity
How bright a star would appear if you were standing right next to it
Observed Brightness
How bright a star appears to be
Cepheid variable stars
Stars that "pulse" in luminosity