Most of the long-period comets in the Solar System come from the outer Oort Cloud. The inner region is much more stable. It's ...
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Earth, the sun and a bike wheel: Why your high-school textbook was wrong about the shape of Earth's orbitIn order to try to understand myself how circular the orbit of the Earth was and other planets, I decided to compare the shape of Earth's orbit to an ordinary 26-inch bike wheel by scaling down ...
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