Why are meteorites useful for studying the formation of Earth?

Meteorites are essential for studying the formation of Earth because they serve as "poor man’s space probes," preserving evidence of the early solar system that has been largely erased or modified on Earth.12

Their utility is based on several key factors:

• Primitive Material: Many meteorites, particularly chondrites, are considered pristine samples of the original solar system material. They are composed of dust and grains that aggregated to form the earliest planetesimals.34
• The Chondritic Model: By comparing the elemental abundances in the Sun and primitive meteorites to the estimated composition of Earth, scientists have developed the "chondritic model," which posits that Earth was built from the accretion of such meteoritic material.4
• Dating the Solar System: Through the study of radioactive isotopes and their decay products, researchers can determine the precise age of meteorites—approximately 4.56 billion years—providing a timeline for when the solar system and Earth formed.54
• Geochemical Insight: Meteorites provide a record of processes like geochemical differentiation, helping scientists understand how Earth’s own internal structure, such as its metallic core, developed during its early accretion.46