CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Planetary formation. Computer artwork of numerous small rocky bodies (planetessimals) accreting to form a planet in the early Solar System. This is a late stage in the accretion process, with only a few planetessimals left. As the planetessimals impact the planet, they turn the surface molten (red areas) and trigger volcanic eruptions. This is the process by which the Earth and the other inner Solar System planets formed around 4.6 billion years ago.
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