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How fast is 6 miles per hour?

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It's about one-fifteen-thousandth as fast as a Meteor
In other words, the speed of a Meteor is 16,000 times 6 miles per hour.
(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 25,000 miles per hour and 160,000 miles per hour, depending on their size. The fireball effect, known as ablation, ceases once the atmosphere has slowed the meteoroid to a velocity of about 6,200 miles per hour.
It's about one-thirty-five-thousandth as fast as a bolt of Lightning
In other words, the speed of a bolt of Lightning is 37,000 times 6 miles per hour.
(atmospheric electrical discharge)
A bolt of lightning can travel at up to 220,000 miles per hour when arcing from the atmosphere to the Earth. An estimated 280 million lightning strikes strikes occur each year.
It's about 0.000000009 times as fast as The Speed of Light
In other words, 6 miles per hour is 0.00000000894698958704290 times the speed of The Speed of Light, and the speed of The Speed of Light is 111,769,438.230730 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 670,616,629.38440 miles per hour, per the formal definition of the meter. While visible light travels close to this speed in air, it slows to 447,077,752.930390 miles per hour when passing through the glass of a typical window.