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How fast is 543 miles per second?

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It's about one-three-hundred-fiftieth as fast as The Speed of Light.
In other words, 543 miles per second is 0.00291492921 times the speed of The Speed of Light, and the speed of The Speed of Light is 343.061504 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 186,282.3970 miles per second, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 124,188.2650 miles per second when passing through the glass of a typical window.
It's about nine times as fast as a bolt of Lightning.
In other words, 543 miles per second is 8.90 times the speed of a bolt of Lightning, and the speed of a bolt of Lightning is 0.110 times that amount.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 60 miles per second when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about twenty times as fast as a Meteor.
In other words, the speed of a Meteor is 0.048 times 543 miles per second.
(formally Meteoroid or meteorite, depending on the context; a.k.a. "shooting star", a.k.a. "falling star")
Small meteoroids enter the Earth's atmosphere at speeds between 6.90 miles per second and 45 miles per second, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 1.70 miles per second.
It's about 100 times as fast as The Space Shuttle.
In other words, 543 miles per second is 112.850 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 0.0088613 times that amount.
(Orbiter vehicle velocity)
The space shuttle orbits at a speed of 4.81170 miles per second. During liftoff, the space shuttle accelerates to orbital speed in 8.5 minutes, consuming over 1.59 million kg (3.51 million lbs) of propellant in the process.
It's about 950 times as fast as a Bullet (Rifle).
In other words, 543 miles per second is 955 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 0.00105 times that amount.
(5.56 x 45 mm, a.k.a. 5.56 NATO)
A 5.56 x 45 mm cartridge is fired at a velocity of 0.5690 miles per second. As the NATO rifle cartridge, it is used by the military forces of more than thirty-one countries, including use in the M16 series, M4 Carbine, HK-416, and M249 Squad automatic weapons used by the United States armed forces.
It's about 1,500 times as fast as a Jet Fighter.
In other words, the speed of a Jet Fighter is 0.00077 times 543 miles per second.
(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 0.410 miles per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about 2,500 times as fast as a Bullet (Handgun).
In other words, 543 miles per second is 2,280 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 0.000439 times that amount.
(for .40 Smith & Wesson 135 grain Sierra JHP, VV 3N37 powder, Fed. 100 primer, Remington case) (muzzle velocity)
A 0.40 caliber Smith & Wesson bullet has a muzzle a velocity of 0.2380 miles per second. This type of ammunition has been the standard issue round of the United States Federal Bureau of Investigation (FBI) since 1990.