Solar system main content.

Solar system

Part of Hall of Meteorites.

B.6. SOLAR SYSTEM hero

The early solar nebula was a turbulent mixture of the chemical elements, including hydrogen, oxygen, carbon, iron and silicon. But how did these elements combine to form the Sun and planets? The answer is unclear—our knowledge of solar system evolution is incomplete.

One feature of the early solar system that is well understood, however, is that temperatures gradually decreased away from the young Sun. This chan