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955 mach is about one-nine-hundred-fiftieth as fast as The Speed of Light.
In other words, it's 0.00105617541 times the speed of The Speed of Light, and the speed of The Speed of Light is 946.8124240 times that amount.
(C) (in a vacuum)
The speed of light (and all other electromagnetic radiation) in a perfect vacuum is known as "c" and measures exactly 904,205.8620 mach, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 602,803.9080 mach when passing through the glass of a typical window.
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