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635 times the speed of light is about 300,000,000 times as fast as a Jet Fighter.
In other words, it's 280,000,000 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 0.00000000360 times that amount.
(for Lockheed Martin F-16, a.k.a. Fighting Falcon, a.k.a. Viper) (maximum speed at altitude)
An F-16's maximum speed at altitude is approximately 0.00000220 times the speed of light. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
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