captainofpizza

captainofpizza t1_j8v3zhp wrote

Imagine a light bright enough to light up the universe and a piece of paper 1 light year wide and tall. The light travels at the speed of light, but if we block it with an object close to its source, the light much much further away will be stopped from projecting onto the paper. If it was a planet that took a day to cross the path of the light relative to the sheet of paper it’s shadow would be seen moving across 365x the speed of light. That darkness sweeping across from lack of light can be much faster than the speed of light because it has no limit.

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