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Distance between Sun and Earth remain same?

Distance between Sun and Earth remain same? - Physics Forum

Distance between Sun and Earth remain same? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #11  
Old 11-06-2008, 11:53 PM
carlip-nospam@physics.ucdavis.edu
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Default Distance between Sun and Earth remain same?

In sci.physics.relativity Sanny <[Only registered users see links. ]> wrote:



The shape and size of the Earth's orbit change in time, due to the
influence of the gravitational fields of the other planets. But the
change is very slow. For example, the orbit is predicted to become
slightly less circular over the next 100 million years, getting up
to an eccentricity of about .06 (that is, a difference of about .2%
between the longest and shortest axis), then more circular over
the following 100 million years. Mercury's orbit is less stable, and
it is conceivable that Mercury could be ejected from the Solar System
over the next five billion years. (These numbers are from computer
simulations; I got them from an article by Laskar in the Proceedings
of the XIth International Congress of Mathematical Physics, 1994.)


There's a nice description at
[Only registered users see links. ]


No.

[...]

It changes slightly with time, because of the effect of other planets' gravity
(along with tiny corrections from general relativity). The Earth's
peihelion -- the point of closest approach to the Sun -- shifts by about
1/300 of a degree per year.

Steve Carlip

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  #12  
Old 11-07-2008, 02:10 AM
N:dlzc D:aol T:com \(dlzc\)
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Default Distance between Sun and Earth remain same?

Dear Double-A:

"Double-A" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
On Nov 6, 1:11 pm, dlzc <[Only registered users see links. ]> wrote:


It is much smaller, such that solar wind would hardly allow it to
retain any atmosphere. And if it formed from "the stuff floating
on top", it would be comprised of the stuff the Moon is.

If you think we have no impact craters here on Earth...
[Only registered users see links. ]
[Only registered users see links. ]
[Only registered users see links. ]
[Only registered users see links. ]
[Only registered users see links. ]
[Only registered users see links. ]


Yes, that and no magnetic field. Jupiter's companions have its
field to help brake *some* gasses.


[Only registered users see links. ]
.... it *may* have a tenuous atmosphere.

[Only registered users see links. ]
.... the Moon does have a tenuous atmosphere.


It resembles most any rocky body with a tenuous atmosphere that
has been anywhere in our solar system for any time.

http://www.astro.psu.edu/users/niel/...lean-moons.jpg
.... Ganymede and Callisto are close cousins to our Moon based on
"looks like".

If you are interested in "tidal rhythmites"
[Only registered users see links. ]

If you are interested in theories of the genesis of our Moon:
[Only registered users see links. ]

Been nice chatting with you.

David A. Smith


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  #13  
Old 11-07-2008, 02:12 AM
Greg Neill
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Default Distance between Sun and Earth remain same?

Double-A wrote:

Atmosphere retention does not depend upon size (mass) alone,
it is strongly depnedent on energy input from the Sun. If
the Earth massed as little as the Moon, it would also have
long ago lost its atmosphere at its proximity to the Sun.


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  #14  
Old 11-07-2008, 02:09 PM
Mike
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Default Distance between Sun and Earth remain same?

On Nov 6, 10:47*am, Uncle Al <[Only registered users see links. ].net> wrote:

Hi Al, still a ray of sunshine I see.
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  #15  
Old 11-07-2008, 05:47 PM
BradGuth
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Default Distance between Sun and Earth remain same?

On Nov 6, 11:53 am, Antares 531 <[Only registered users see links. ]> wrote:

Because it's what a devout Zionist/Nazi of the Rothschild kind does
best. It's all about the me, me, me factor, and the screw everyone
and most everything else in sight policy of their mainstream status
quo, or bust..

~ BG
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  #16  
Old 03-31-2012, 11:13 AM
Pipette Filler
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Default Re: Distance between Sun and Earth remain same?

answer of the questions are
Yes, it becomes more circular.
pretty much.
No
Balderdash...
I n the same period
Almost.
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  #17  
Old 04-04-2012, 05:51 PM
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Default Re: Distance between Sun and Earth remain same?

hi
thanks..
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  #18  
Old 04-04-2012, 05:52 PM
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Default Re: Distance between Sun and Earth remain same?

Hi friends..........
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  #19  
Old 04-04-2012, 05:52 PM
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Default Re: Distance between Sun and Earth remain same?

good topic.......
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  #20  
Old 04-04-2012, 05:53 PM
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Default Re: Distance between Sun and Earth remain same?

Hi,


helpful comment
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