The Oort cloud is a vast, spherical region of space thought to surround the Sun, with a radius measured in thousands of astronomical units (1 AU being the Earth-Sun distance). Evidence for it comes from the orbits of long-period comets, which seem to hail from a great distance from the Solar System. This schematic shows how the Solar System is an insignificant part of the Sun's family.
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TPG34333254
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達志影像
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