"So far we don't have any other satisfactory explanation for the continued supply of long period comets we observe," says Cyrielle Opitom, who studies comets and the Solar System at the University of Edinburgh. "When reconstructing their orbits, they seem to share an aphelion – farthest distance from the sun – at around 20,000 times the distance from the Sun to the Earth, in what we call the Oort Cloud."
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