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Planet's density
On Thu, 13 Dec 2012 09:17:42 +0100, Szczepan Bialek wrote:
The Moons do not rotate and there no magnetic field. The moon does rotate otherwise we wouldn't have the same side facing us all the time. -- Cheers Dave. |
#12
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Planet's density
In uk.sci.astronomy message
, Tue, 11 Dec 2012 17:16:34, Barry Schwarz posted: Compared to almost any other non-manmade object, the mass of the ISS is quite small. That depends on your definition of "object". The Solar System contains a large number of small objects of the sort that end up as meteors. The Sahara also contains a large number of objects : grains of sand (with the occasional camel, jerboa, etc.). Does ISS attract the cosmonauts or repel them? And it would repel them because? The gravitational force between two objects is proportional to the product of their masses. There is no **noticeable** attraction between the ISS and the supply ships that dock with it periodically. The mass of the supply ship is orders of magnitude more than the mass of a cosmonaut. The attraction between the ISS and a cosmonaut would therefore be orders of magnitude less. Only just "orders" - a cosmonaut weighs something under 100kg and a Soyuz around 100 times more. The surface of the Hill sphere of a Soyuz re-entry capsule may well be outside the surface of the capsule, and so it could be possible to orbit around the outside of a Soyuz. IMHO, without calculation, it should be possible for a Lunar Soyuz in mid-path. The period would, of course, be hours. Outside the Earth-capsule Roche Limit, the capsule will by definition attract a cosmonaut particle. -- (c) John Stockton, nr London, UK. Mail via homepage. Turnpike v6.05 MIME. Web http://www.merlyn.demon.co.uk/ - FAQqish topics, acronyms and links; Astro stuff via astron-1.htm, gravity0.htm ; quotings.htm, pascal.htm, etc. No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News. |
#13
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Planet's density
On Dec 13, 9:44*am, "Dave Liquorice"
wrote: On Thu, 13 Dec 2012 09:17:42 +0100, Szczepan Bialek wrote: The Moons do not rotate and there no magnetic field. The moon does rotate otherwise we wouldn't have the same side facing us all the time. -- Cheers Dave. The only person ever to propose something as hideous as a spinning moon did so barely a paragraph after he has Venus turn once in 23 hours and the Earth to stellar circumpolar motion in 24 hours ! - http://books.google.ie/books?id=gB2-...page&q&f=false They did put up somewhat of a struggle in the middle of the 19th century to reason their way out of something that is dysfunctional as a spinning moon but failed as your response demonstrates and so it remains that there are people who make an effort to justify a spinning moon and others who know no better follow them. The fact is that planets do turn once to the central Sun as the polar coordinates are carried around in a circle thereby replacing axial precession as a long term axial trait to an annual orbital trait and responsible for the polar day/night cycle - http://www.daviddarling.info/images/...gs_changes.jpg No point in throwing good information after something as dumb as a spinning moon,that it is even entertained demonstrates a type of mental slavery which the wider world knows little about. |
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Planet's density
"Dave Liquorice" napisal w wiadomosci ll.co.uk... On Thu, 13 Dec 2012 09:17:42 +0100, Szczepan Bialek wrote: The Moons do not rotate and there no magnetic field. The moon does rotate otherwise we wouldn't have the same side facing us all the time. The Moon and the Earth rotate as the pair. But in that pair only the Earth rotate around the Earth axis. Rowland do not examine the magnetic field of a pair of charged bodies. The pair where the distance is very big. S* |
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Planet's density
"Dr J R Stockton" napisal w wiadomosci news In uk.sci.astronomy message , Tue, 11 Dec 2012 17:16:34, Barry Schwarz posted: Compared to almost any other non-manmade object, the mass of the ISS is quite small. That depends on your definition of "object". The Solar System contains a large number of small objects of the sort that end up as meteors. The Sahara also contains a large number of objects : grains of sand (with the occasional camel, jerboa, etc.). Does ISS attract the cosmonauts or repel them? And it would repel them because? The gravitational force between two objects is proportional to the product of their masses. There is no **noticeable** attraction between the ISS and the supply ships that dock with it periodically. The mass of the supply ship is orders of magnitude more than the mass of a cosmonaut. The attraction between the ISS and a cosmonaut would therefore be orders of magnitude less. Only just "orders" - a cosmonaut weighs something under 100kg and a Soyuz around 100 times more. The surface of the Hill sphere of a Soyuz re-entry capsule may well be outside the surface of the capsule, and so it could be possible to orbit around the outside of a Soyuz. IMHO, without calculation, it should be possible for a Lunar Soyuz in mid-path. The period would, of course, be hours. Outside the Earth-capsule Roche Limit, the capsule will by definition attract a cosmonaut particle. "By the definition". But what is in reality. Can you ask a "particle"? S* |
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