How do meteorites form?

Old dust makes new rocks

Meteorites come from many different sources. A meteorite is a piece of rock from outerspace that strikes the surface of the Earth. It is believed that meteorites formed from dust from the early solar system. The dust clumped together. Perhaps electrical charges or gravitational attraction made this happen. The clumps melted. We are uncertain of the reasons for the melting. Heat from star systems may have caused it--or radioactivity in the clumps themselves. When the clumps melted, small spheres were formed. These are chondrules. This would mean that they are very old. Scientists have used radiometric dating to measure the ages of meteorites. The results show ages of around 4,500,000,000 years--about seven hundred million years older than the oldest rocks on Earth. Some Meteorites were once comets, that broke up in smaller parts due to strong forces, when they pass the strong gravity of the sun, or when they heat up... They are called meteors just because they fall on earth, mostly in showers.