Because most meteors are pieces of asteroids, meteors’ main source is the Asteroid Belt between Mars and Jupiter.
However, meteors do not hit Earth, they merely make it to the atmosphere above us. If a meteor makes it through that, then it is called a “meteorite,” and can range in size from a grain of sand to a boulder.
According to NASA a meteor appears when a piece of metallic or stony material called a meteoroid enters the atmosphere. The heat from the friction of the air in the atmosphere causes the meteoroid to glow. The heat also creates a shining trail of gas and melted meteoroid particles. The meteoroids that cause meteors are usually no larger than a pebble, and become visible when they are between 40 and 75 miles away from the surface of the Earth.
Most meteoroids never reach the ground, but those that do are called meteorites.
Meteors can come from a variety of sources since they are essentially any object that enters Earth’s atmosphere originating in space, a common source of the material in large scale meteor showers is the asteroid belt between Mars and Jupiter.
There are volumes of books dedicated to this subject, here’s the best brief answer that I could find:
“Astronomers believe that an estimated 1,000 tons of meteoric dust and rock enter the Earths atmosphere every day from deep space. The dust and rock could have come from supernovas(exploding star), collision of meteors, chips off asteroids, and just pieces still floating around from formations of planets and moons. Another way that meteors form are from comets. When comets get closer to the sun, the suns heat waves melt the comets ice that was holding the meteoric dust and rock, letting the debris fall.”
All answers before this one raise valid points as well.
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