Solar System

Beyond the eight planets: the star that holds the whole structure together, its overall organization, and the story of its formation 4.6 billion years ago.

The Sun

Internal structure, solar activity, and the central role it plays throughout the system.

Structure of the System

Inner and outer system, asteroid belt, Kuiper belt, and Oort cloud.

Formation and Evolution

Solar nebula, protoplanetary disk, accretion, and the late heavy bombardment.

The Moon

Its formation by a giant impact, synchronous rotation, phases, and the Apollo missions.