Difference between revisions of "Planet"
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| − | A '''planet''' is a astronomical body that is in [[orbit]] around a [[star]], has sufficient mass for its own [[gravity]] to overcome rigid body forces so that it assumes | + | A '''planet''' is a astronomical body that is in [[orbit]] around a [[star]], has sufficient mass for its own [[gravity]] to overcome rigid body forces so that it assumes an approximately spherical shape, and has cleared the neighborhood around its orbit <ref>http://www.iau.org/iau0603.414.0.html</ref>. |
The phrase "cleared the neighborhood around its orbit" refers to a body "sweeping out" the area around its orbit as it forms, by causing all other smaller bodies in its orbit to accrete with it. As a consequence it does not then share its orbital region with any other bodies of significant size, except for satellites or those collected later under its gravitational influence. | The phrase "cleared the neighborhood around its orbit" refers to a body "sweeping out" the area around its orbit as it forms, by causing all other smaller bodies in its orbit to accrete with it. As a consequence it does not then share its orbital region with any other bodies of significant size, except for satellites or those collected later under its gravitational influence. | ||
== Young Earth Creationism View == | == Young Earth Creationism View == | ||
| − | [[Young earth creationism|Young earth creationist]] assert that [[materialism|materialistic]] explanations of the planet formation are inadequate and contra- | + | [[Young earth creationism|Young earth creationist]] assert that [[materialism|materialistic]] explanations of the planet formation are inadequate and contra-evidential. <ref>http://www.creationscience.com/onlinebook/AstroPhysicalSciences3.html</ref><ref>http://www.answersingenesis.org/home/area/faq/astronomy.asp</ref> In addition, creationists often cite the secular scientific literature in order to make the case that materialist explanations of planet formation are inadequate: |
Revision as of 18:11, May 28, 2007
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A planet is a astronomical body that is in orbit around a star, has sufficient mass for its own gravity to overcome rigid body forces so that it assumes an approximately spherical shape, and has cleared the neighborhood around its orbit [1].
The phrase "cleared the neighborhood around its orbit" refers to a body "sweeping out" the area around its orbit as it forms, by causing all other smaller bodies in its orbit to accrete with it. As a consequence it does not then share its orbital region with any other bodies of significant size, except for satellites or those collected later under its gravitational influence.
Young Earth Creationism View
Young earth creationist assert that materialistic explanations of the planet formation are inadequate and contra-evidential. [2][3] In addition, creationists often cite the secular scientific literature in order to make the case that materialist explanations of planet formation are inadequate:
“... most every prediction by theorists about planetary formation has been wrong.” Scott Tremaine, as quoted by Richard A. Kerr who was proposing a new planetary formation model, “Jupiters Like Our Own Await Planet Hunters,” Science, Vol. 295, 25 January 2002, p. 605 [4]
"No one knows quite how planetesimals ever attain protoplanet status." (D. Kaisler, The puzzles of planethood, Sky & Telescope 104(2):32-38, 2002.
“It turns out to be surprisingly difficult for planetesimals to accrete mass during even the most gentle collisions.” Erik Asphaug, “The Small Planets,” Scientific American, Vol. 282, May 2000, p. 54. [5]
References
- ↑ http://www.iau.org/iau0603.414.0.html
- ↑ http://www.creationscience.com/onlinebook/AstroPhysicalSciences3.html
- ↑ http://www.answersingenesis.org/home/area/faq/astronomy.asp
- ↑ http://www.creationscience.com/onlinebook/ReferencesandNotes43.html
- ↑ http://www.creationscience.com/onlinebook/ReferencesandNotes46.html
