select the correct answer.\nwhich phenomenon related to light allows scientists to measure the distance…

select the correct answer.\nwhich phenomenon related to light allows scientists to measure the distance between a star and earth?\na. dark patches appear in the electromagnetic spectrum emitted by stars.\nb. light waves spread out as they move farther from their source.\nc. stars have different colors based on their temperature.\nd. stars have unique elements that make up their atmospheres.

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