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"What is a redshift?" (Ask an Astronomer)
'Ask an Astronomer' uses an astronomer, a flying saucer, and a cow to help explain this difficult astronomical concept in simple terms.
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By NASA's Spitzer Science Center / IPAC / NASA / Caltech'Ask an Astronomer' uses an astronomer, a flying saucer, and a cow to help explain this difficult astronomical concept in simple terms.