Formation of the Solar System

Our solar system consists of one star (the Sun), eight planets and all their moons, three dwarf planets, and several thousand small solar system objects—asteroids, comets, trans-Neptunian objects, and other small bodies. The Sun's age was calculated in 1989 to be 4.5 billion years old, less than the 4.7 billion years previously believed. It was formed from a cloud of hydrogen mixed with small amounts of other substances that had been produced in the bodies of other stars before the Sun was born. This was the parent cloud of the solar system. The dense, hot gas at the center of the cloud gave rise to the Sun; the outer regions of the cloud—cooler and less dense—gave birth to the planets.

This video shows how a solar system forms.
Video courtesy of NASA


The Solar System The Sun

More on Formation of the Solar System from Fact Monster:

  • solar system: Origin of the Solar System - Origin of the Solar System Besides explaining the birth of the sun, planets, dwarf planets, moons, ...
  • astrophysics - astrophysics astrophysics, application of the theories and methods of physics to the study of ...
  • solar system - solar system solar system, the sun and the surrounding planets, natural satellites, dwarf planets, ...
  • COMETS - A comet is a small, icy lump that travels in toward the Sun from the outer reaches of the Solar System. As it warms up, it develops a shining head and
  • Thomas Chrowder Chamberlin - Chamberlin, Thomas Chrowder Chamberlin, Thomas Chrowder, 1843–1928, American geologist, b. ...