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Brian Cox explains why light from stars & galaxies takes time to travel to Earth. Light's the fastest thing in the Universe but it's not infinitely fast; so the further an object is from us the further back in time we see it.
ŘADA: 1
Brian Cox explains why light from stars & galaxies takes time to travel to Earth. Light's the fastest thing in the Universe but it's not infinitely fast; so the further an object is from us the further back in time we see it.
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