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The cloud theory was postulated by Estonian Astronomer Ernst Opik
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Oort Cloud theory is proposed by dutch astronomer Jan Oort, and is accepted by the scientific community.
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J.G. Hills proposes the idea of an inner oort cloud
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Richard A. Muller hypothesises that the sun has a red or brown dwarf companion, Nemisis, that passes through the oort cloud every 26 million years
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Comets from the inner oort cloud that come within Jupiters gravitational pull are trapped and forced to collide with the planet
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John Matese and Patrick Whitman and their collegues created a galactic plane to track comets and astroids in the oort cloud
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Matese and Daniel Whitmire track a certain group of astroids and find that some are forced out by larger and more powerful astroids
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Matese hypothesises that more comets are entering the inner solar system. It has been thought that a gas giant, Tyche, is causing these astroids and comets to leave the normal orbit.
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"Oort Cloud." Timetoast. N.p., n.d. Web. 12 Dec. 2013.
