JEAN-FRANCOIS PODEVIN / SCIENCE PHOTO LIBRARY JEAN-FRANCOIS PODEVIN / SCIENCE PHOTO LIBRARY
Planetary formation. Conceptual computer artwork of planetesimals during the early history of the solar system, showing the Sun at centre. Planetesimals were irregularly shaped pieces of rocky debris, which were gravitationally attracted to each other and collided, eventually forming protoplanets. In the history of the solar system, planets formed soon after the Sun, about 4.6 billion years ago.
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