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504 feet per hour is about one-one-millionth as fast as a Meteor.
In other words, it's 0.000001000 times the speed of a Meteor, and the speed of a Meteor is 1,000,000 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 130,000,000 feet per hour and 850,000,000 feet 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 33,000,000 feet per hour.
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