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The prefix "milli" means one-thousandth; therefor, there are 1,000 milliseconds in a second. These units of time measurement are constant, unlike the "year" or the "day". No matter what location of the universe, this ratio will always be the same and one second on Earth is the same as one second on every other planet. The only possible exception to this is in a black hole; it is speculated that time in a black hole is actually faster than time outside of one. This is of course a very unstable and improvable theory.