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How fast is 543 miles per second?

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It's about 30,000 times as fast as a Cheetah.
In other words, 543 miles per second is 28,470 times the speed of a Cheetah, and the speed of a Cheetah is 0.000035120 times that amount.
(Acinonyx jubatus)
The cheetah can reach speeds of up to 0.01907 miles per second in short bursts. From a crouching position, the cheetah can attain these speeds in just 2.25 seconds.
It's about 30,000 times as fast as a Knuckleball (baseball).
In other words, 543 miles per second is 29,000 times the speed of a Knuckleball (baseball), and the speed of a Knuckleball (baseball) is 0.0000340 times that amount.
(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)
The average speed of major league knuckleball pitch is 0.019 miles per second. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.
It's about 40,000 times as fast as a Gazelle.
In other words, the speed of a Gazelle is 0.0000300 times 543 miles per second.
(for Thomson's Gazelle, a.k.a. Eudorcas thomsoni, a.k.a. "Tommie", a.k.a. "Tommy")
A Thomson's gazelle can reach speeds of up to 0.01 miles per second. The gazelle's speed doesn't match that of its chief predator, the cheetah, but a gazelle's endurance usually ensures an escape in distances greater than 500 m (0.3 mi).
It's about 40,000 times as fast as a Hare.
In other words, the speed of a Hare is 0.0000300 times 543 miles per second.
(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)
The European Hare can run at speeds of up to 0.01 miles per second. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.
It's about 45,000 times as fast as a Greyhound.
In other words, 543 miles per second is 43,500 times the speed of a Greyhound, and the speed of a Greyhound is 0.0000230 times that amount.
(a.k.a. English greyhound) (approximate maximum speed)
Greyhounds reach average race speeds of 0.0125 miles per second. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.
It's about 50,000 times as fast as Secretariat.
In other words, the speed of Secretariat is 0.00001920 times 543 miles per second.
(at Belmont Stakes, 1973)
Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 0.0104 miles per second in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.
It's about 85,000 times as fast as Michael Johnson.
In other words, 543 miles per second is 84,430 times the speed of Michael Johnson, and the speed of Michael Johnson is 0.000011840 times that amount.
(a.k.a. Michael Duane Johnson) (sprinter; 1967-) (at the Atlanta Olympics, 1996)
Setting a record that stood for 12 years, Michael Johnson ran a 200 m in 0:19.32 for an average speed of 0.006433 miles per second at the 1996 Olympics. Johnson was nicknamed "the Man with the Golden shoes" in recognition of the custom footwear worn during these races — a pair of Nikes with a left size of 10.5 and a right size of 11.