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Comet 12P/Pons-Brooks and galaxies, 2024
Comet 12P/Pons–rooks (blue, bottom-right), the Andromeda galaxy (centre-right), Triangulum galaxy (left) and Mirach (yellow star, centre-left) photographed on 4 March 2024 from Slovakia. Pons-Brooks is only visible for a short time every 71.2 years, which is the length of time it takes to orbit the Sun. It was first discovered in 1812 by Louis Pons, and is estimated to be around 30 km in diameter. Comets are collections of dust and ice that orbit the Sun. As they near the Sun and are warmed they release gas (outgassing) that forms the tail., by PETR HORALEK/SCIENCE PHOTO LIBRARY
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