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How fast is 73 miles per second?

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It's about one-and-one-fifth times as fast as a bolt of Lightning.
In other words, the speed of a bolt of Lightning is 0.830 times 73 miles per second.
(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 three times as fast as a Meteor.
In other words, 73 miles per second is 2.80 times the speed of a Meteor, and the speed of a Meteor is 0.360 times that amount.
(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 fifteen times as fast as The Space Shuttle.
In other words, 73 miles per second is 15.1720 times the speed of The Space Shuttle, and the speed of The Space Shuttle is 0.065911 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 150 times as fast as a Bullet (Rifle).
In other words, 73 miles per second is 128 times the speed of a Bullet (Rifle), and the speed of a Bullet (Rifle) is 0.00781 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 200 times as fast as a Jet Fighter.
In other words, 73 miles per second is 180 times the speed of a Jet Fighter, and the speed of a Jet Fighter is 0.0056 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 0.410 miles per second. The F-16 has a flight ceiling of approximately 15 km (9.32 mi).
It's about 300 times as fast as a Bullet (Handgun).
In other words, 73 miles per second is 306 times the speed of a Bullet (Handgun), and the speed of a Bullet (Handgun) is 0.00327 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.
It's about 350 times as fast as The Speed of Sound.
In other words, 73 miles per second is 343 times the speed of The Speed of Sound, and the speed of The Speed of Sound is 0.00292 times that amount.
(in dry air at 20°C)
The speed of sound in dry air at 20°C (68°F) is 0.2130 miles per second. Air is a relatively poor acoustic conductor, however, as sound will travel at speeds of between 0.930 miles per second to 0.9690 miles per second in water, depending on its salinity.