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1) Uranus and Neptune, are mostly composed of hydrogen and helium.
2) Most of the objects in the solar system are composed of ice.
3) Some possible dwarf planets have moons.
4) Short-period comets do not come from the Oort Cloud
5) Until the Late Middle Ages, everyone was sure the Earth was at the
centre of the universe .
6) Friedrich Bessel proved that the Earth moves around the Sun.
