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Level 17

Astronomical Distances and Brightness ~ Reversed

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