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Talk:Mystery:Gaseous Planetary Envelopes (view source)
Revision as of 22:18, September 6, 2008
, 22:18, September 6, 2008reply to SCarter
:All in all i find this article terribly confusing it its points and lacking and citing for what it describes are the main points of this "mystery", That saturn and jupiter currently have gas envelopes but earth and neptune do not. --[[User:SCarter|SCarter]] 16:13, 6 September 2008 (EDT)
:All in all i find this article terribly confusing it its points and lacking and citing for what it describes are the main points of this "mystery", That saturn and jupiter currently have gas envelopes but earth and neptune do not. --[[User:SCarter|SCarter]] 16:13, 6 September 2008 (EDT)
::SCarter, thank you for your interest in this article however I politely disagree with your points. The articles cited may claim to explain why the Earth has no gaseous envelope, but this is an ad-hoc explanation. They observed that planets that were the Earth's distance (or less) from the sun and which were the Earth's size (or less) did not have gasesous envelopes, so then they argued that there must have been something shielding them--the concept of an <i>inner</i> solar nebula and this region happened to be defined to be just big enough to cover these planets and therefore "explain" the formation difference in these planets. Sounds like [[circular reasoning]] to me. Furthermore, it says nothing about why Neptune has no gaseous envelope --that planet is even further out than Jupiter and Saturn so it certainly wasn't in the "inner solar nebula" that the Earth was supposedly in.
::The scientists are not in agreement at all - the contending ideas (bottom-up or top-down) are as far apart as you can be and the scientists themselves admit that a preference for one idea over another would be purely theoretical. If you still feel the cited sources are insufficient, I would invite you to find some more. As I mentioned at the start of the talk page, there were many articles that talked about these points and those four were what I found in just a half hour search! -[[User:Foxtrot|Foxtrot]] 18:18, 6 September 2008 (EDT)