DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Planet formation in the early solar system, artwork. Early in the life of the solar system there was a large amount of debris orbiting in a disc around the newly-formed Sun. Mutual gravitational attraction (accretion) of particles formed asteroids, which then joined together to form larger bodies, eventually creating the planets. The Sun formed around 4.6 billion years ago.
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