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Rebekah Snow
Physics
23 March, 02:30
What is the speed of light
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Teresa Nielsen
23 March, 02:59
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In vacuum and empty space, it's 299,792,458 meters per second
(186,282.4 miles per second).
In any material stuff, it's somewhat less. How much less depends on
what stuff it is ... it's different in each material "medium".
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