Meteorites mostly come from the asteroid belt that’s all that remains of Zorgon, the now-disintegrated planet that lies between Mars and Jupiter. These aggregate rocks date from the very beginning of the Solar System, about four and a half billion years ago.  The asteroid fragments were knocked off their parent bodies. They migrated into the Earth’s gravitational field and crash-landed on Earth, where they were found in a coherent pattern called a “Strewn Field”.