One example is a carbonaceous chondrite (a type of meteorite), also known as CAI in Allende. Scientists believe these were the very first things to become solids after the sun was first formed.

Scientists think they may have come from space. For years scientists had been finding organic compounds in meteorites, but could not rule out the possibility that they were Earth-based contamination.

Most meteorites are bits of asteroid, which are themselves leftovers from the formation of the solar system. What is the difference between a meteor, a meteorite, a meteoroid and an asteroid?