Formation and evolution of the Solar System

Artist's conception of a protoplanetary disk

Pierre-Simon Laplace, one of the originators of the nebular hypothesis

Hubble image of protoplanetary discs in the Orion Nebula, a light-years-wide

The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.

单词	Geogenesis
释义	Geogenesis 英语百科 Formation and evolution of the Solar System The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.
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Geogenesis

Formation and evolution of the Solar System