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Nature 409, 589-591 (1 February 2001) | doi:10.1038/35054508;
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Head, Protein Production Unit
- The Novo Nordisk Foundation Center for Protein Research
- Copenhagen 2200 Denmark
Senior Research Fellow - Atlantic Ocean Circulation and Climate
- University of Southampton
- Southampton / Hampshire United Kingdom
Rapid collisional evolution of comets during the formation of the Oort cloud
The Oort cloud of comets was formed by the ejection of icy planetesimals from the region of giant planets—Jupiter, Saturn, Uranus and Neptune—during their formation. Dynamical simulations have previously shown that comets reach the Oort cloud only after being perturbed into eccentric orbits that result in close encounters with the giant planets, which then eject them to distant orbits about 104 to 105|[thinsp]|AU from the Sun (1|[thinsp]|AU is the average Earth–Sun distance).
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