History In 2493 (1950) British astronomer Netherlands Jae od green (Jan Oort) who proposed the theory that the. There must be a source of several million number of Comet-Moon is far beyond the planets in the solar system outside the Sun out, away from the Sun until the astronomical unit is approximately 1 30000 light-year or beyond, then call the local address of a Comet, according to this notion, showing that Comet od (The Oort Cloud)
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