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What does the Bortle scale refer to?

spectrum of the stars

types of nebulae

brightness of the night sky

size of the planets

The Bortle scale is a nine-level numeric scale that measures the night sky's brightness of a particular location. It quantifies the astronomical observability of celestial objects and the interference caused by light pollution. It was created by John E. Bortle in 2001.

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16

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143

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316

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294

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99

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4553

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20

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10

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