Brian Cox: Light and looking back in time

Brian Cox: Light and looking back in time is an unknown kind of entity.

Professor Brian Cox explains why light from stars and galaxies takes time to travel to Earth.

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Brian Cox: Light and looking back in time
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po:synopsis Professor Brian Cox explains that light is 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. He outlines that the light we see from the Sun left its surface 8 minutes ago, and the light from our nearest galaxy, Andromeda, is 2.5 million years old. The Hubble Ultra Deep Field space telescope has taken pictures of a piece of space which is so far away the light has taken 13 billion years to reach us.[en]
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