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QUWhen we observe a star 80 light-years away, we’re actually seeing light that left it 80 years ago. Light travels at a finite speed, so the farther a star is, the older the image we see. Telescopes let us witness the history of the universe, showing stars and galaxies as they were long before we looked up.”
#LightYears #Astronomy #SpaceFacts #Telescopes #universe
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