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Answer In vacuum, the speed of light is 186,282.397 miles per second. Answer The speed of light is not a constant. It is slowing down. zthere have been several experiments that prove that light is slowing down.
186,282.4 miles per second.

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11y ago
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9y ago

That would work out to about 983,571,087.9 feet per second in vacuum,
somewhat less in any material medium.

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9y ago

Approx 984,000,000 feet per sec.

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Q: What is the speed of light in miles per second?
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