| LC control no. | sh 86000523 |
|---|---|
| Geographic heading | Oort Cloud |
| Variant(s) | Cloud, Oort Oort-Öpik Cloud |
| See also | Interstellar matter Trans-Neptunian objects Comets |
| Special note | This heading is not valid for use as a geographic subdivision. |
| Found in | Work cat.: Halley [Motion picture] ... 1985. NASA Thes. (Oort cloud. Def.: a region of millions of comets between 30,000 and 100,000 A.U. from the Sun. Comets are perturbed out of the Oort cloud by passing stars and fall into the inner solar system. The Oort cloud was named after the Dutch astronomer Jan Hendrik Oort.) Room, A. Dict. of astronomical names, 1988 (Oort Cloud: the name given to the 'cloud' of gas, dust and comets that, according to the theory proposed by the Dutch astronomer J.H. Oort in 1950, orbit the Sun at a distance of about 40,000 A.U.) Mitton, J. Cambridge dict. of astronomy, 2001 (Oort cloud/Oort-Öpik cloud: a spherical shell surrounding the solar system at a distance of about 1 light year (50,000 A.U.), consisting of billions of comets) Firefly astronomy dict., 2003 (Oort Cloud (Oort-Öpik Cloud): region of space surrounding the Solar System in which comets are thought to reside) Wikipedia, Nov. 16, 2007 (Trans-Neptunian object: any object in the solar system that orbits the sun at a greater distance on average than Neptune. The Kuiper belt, Scattered disk, and Oort cloud are names for three divisions of this volume of space.) |
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