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An optical photo of the Andromeda Galaxy, the nearest major galaxy to our own Milky Way. It takes light about two million years to reach us, a distance that was determined by looking at its Cepheid stars. New research studies Cepheid stars in the infrared, where their light is less obscured by dust.
Credit: Robert Gendler
Low Resolution Image (jpg)
Credit: Robert Gendler
Low Resolution Image (jpg)
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