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Subject: The speed of light

shadow27 29.04.17 - 10:57am
I looked it up and started reading about a strange empty region in space:

The latest study suggests that the supervoid may be draining energy from light travelling through, which is why the area around it is so cold.
Getting through such a big hole takes hundreds of millions of years, even at the speed of light, and photons of light slow down as they cross because the universe - and therefore the void - is continually expanding.

Astronomers have discovered a curious empty section of space which is missing around 10,000 galaxies. The supervoid is 1.8 billion light-years across *

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