About 5 billion years ago, the solar system (including the sun, planets, asteroids, and comets) was formed by the condensation of a cloud of dust and gas, known as the solar nebula. The first solid object is a millimeter-sized sphere called an orbone. They have joined together over the course of millions of years to form larger and larger chunks. After colliding, they aggregated to form an asteroid body, and finally, about 4.5 billion years ago, 8 large planets and other smaller celestial bodies made up the solar system.
The huge gaps between the orbits of the eight major planets are filled with debris left over from earlier times. In addition, a region between Mars and Jupiter is home to thousands of smaller planetary bodies known as asteroids. They occasionally collide (more often in the past), splattering more rocks and metal fragments into the solar system.
If one of the fragments meets the Earth during its orbit around the Sun, it will be heated to more than 6,000 degrees Celsius due to friction with the atmosphere. That's why we often see meteors at night. If a piece is large enough, it may survive and reach the Earth's surface. This remnant is known as a meteorite.
In general, there are three types of meteorites:
1) Chondrites: fragments of ancient rocks left over from the beginning of the formation of the solar system. They usually contain chondrites and are about 4.5 billion years old.
2) Chondrites: stony material ejected from the surface of a planet, asteroid, or moon by the impact of another object. Anchondrites originate from many celestial bodies, including asteroids such as Mars, the Moon, and Vesta.
3) Iron meteorites and stony-iron meteorites: are fragments from the core of a fully formed asteroid that was destroyed in a collision billions of years ago. As the first planets grew in size, heavy elements such as nickel and iron sank to their centers, forming metal cores, just like Earth.
Generally, meteorites are named after the place where they fell or were found. That's why the iron meteorite that caused the Arizona crater is called the "Dark Canyon", and the iron meteorite that was over Russia in 1947 is called "Sikhot-Alin".