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In particular, he hypothesised that the planet [[Venus]] was ejected from [[Jupiter]] around 1450 BC, and in a comet-like form, careered around the solar system disrupting the orbits of both [[Mars]] and [[Earth]] before settling into its present orbit.<ref>"[http://en.wikipedia.org/wiki/Worlds_in_Collision Worlds in Collision]" at Wikipedia</ref> The resulting cosmic catastrophes, he believed, were described in various ancient and biblical texts, including for example, the parting of the [[Red Sea]] and the Sun standing still. He described these ideas in his best-selling book, ''Worlds in Collision'' (1950)<ref>Velikovsky, Immanuel (1950). ''Worlds in Collision'', Macmillan. ISBN 1-199-84874-3.</ref> To accompany his astronomical theories he devised a new chronology for [[Ancient Egypt]], moving the end of the Middle Kingdom to 1450 BC and making it coincide with the [[Exodus]]. This he described in his book, ''Ages in Chaos'' (1952).<ref> Immanuel Velikovsky, ''Ages in Chaos'', (1952) Doubleday</ref>

In particular, he hypothesised that the planet [[Venus]] was ejected from [[Jupiter]] around 1450 BC, and in a comet-like form, careered around the solar system disrupting the orbits of both [[Mars]] and [[Earth]] before settling into its present orbit.<ref>"[http://en.wikipedia.org/wiki/Worlds_in_Collision Worlds in Collision]" at Wikipedia</ref> The resulting cosmic catastrophes, he believed, were described in various ancient and biblical texts, including for example, the parting of the [[Red Sea]] and the Sun standing still. He described these ideas in his best-selling book, ''Worlds in Collision'' (1950)<ref>Velikovsky, Immanuel (1950). ''Worlds in Collision'', Macmillan. ISBN 1-199-84874-3.</ref> To accompany his astronomical theories he devised a new chronology for [[Ancient Egypt]], moving the end of the Middle Kingdom to 1450 BC and making it coincide with the [[Exodus]]. This he described in his book, ''Ages in Chaos'' (1952).<ref> Immanuel Velikovsky, ''Ages in Chaos'', (1952) Doubleday</ref>

Some problems with his theory include the fact that Velikovsky offered no mechanism to explain how Jupiter could have expelled Venus without disrupting the complex system of rings and moons, where the energy for such a massive expulsion came from, and why a gas planet like Jupiter would expel a rocky planet like Venus.

Velikovsky's ideas were met with vigorous criticism, arguing that the science contradicted Velikovsky's findings, re-enforced by the conclusions of a 1974 conference by the American Association for the Advancement of Science, "Velikovsky's Challenge to Science".<ref>Donald W. Goldsmith (Editor), ''Scientists Confront Velikovsky'' (1977), Cornell University Press, ISBN 0801409616, ISBN-13 978-0801409615.</ref>

==References==

==References==