The planets furthest away from the sun are all very cold, so Uranus, Neptune and Pluto, with Pluto the furthest away and so the coldest. And other bodies, like comets and dwarf planets which live out beyond Neptune and Pluto are very very cold because they are so far away from the sun and don’t have anything else to keep them warm.
Hello Hugo, Pluto is certainly the coldest planet (dwarf planet) in our Solar System. That’s because it is the furthest from the Sun so heat takes a very long time to reach it! There might be colder planets in our Milky Way galaxy and scientists are busy looking for them! 🙂
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