standard ruler
Sign in to saveastronomical object of well-known physical size, used to determine distance via trigonometry
Connections
cosmic distance ladder
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baryon acoustic oscillations
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Earth
Concept
astronomy
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International Standard Book Number
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trigonometry
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cosmology
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radian
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redshift
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parallax
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Hubble–Lemaître law
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observable universe
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University of British Columbia
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expansion of the universe
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Wiley
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American Physical Society
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Sky & Telescope
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luminosity distance
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Angular diameter distance
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