Re: Indefinite problems in Universal physics may be answered


"Koobee Wublee" <kublai@xxxxxxx> wrote in message
news:R9H2e.1020$ZV5.200@xxxxxxxxxxxxx
>
> "Bill Hobba" <bhobba@xxxxxxxxxxxxxx> wrote in message
> news:6CF2e.18177$C7.7457@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > [...] gravity is space-time curvature [...]
>
> There is a problem with theories explaining gravity as the result of the
> environment around one or several objects/momentum/energy, such as GR.
>
> Let me explain more clearly this time. So, you don't have to dwell on
> personal insult or just sweeping this problem under the carpet.
>
> If there is only one object, we have the object creating a fabric of
> spacetime where all other objects with negligible mass compared to the
> central mass would 'fall' into the curvature of the spacetime. This is
> gravity, and there is no problem with this scenario.
>
> If there are two objects, the fabric of spacetime would have its highest
> degree of curvature right at the center of mass of the two objects. Each
> object would try to 'fall' into the point where the center of mass is.
This
> again is gravity, and there is no problem with this scenario, either.
>
> If there are two objects in the system such as the sun, the earth, and the
> moon, the fabric of spacetime should also have the highest degree of
> curvature at the center of mass of the system.

BTW the highest degree of curvature does not occur at the center of mass of
the system.

> Now, here is the problem.
> When the moon is right in between the sun and the earth, the curvature of
> spacetime cannot have the moon 'fall' into the earth while the earth
'falls'
> into the sun.

Nor does GR say it does - since it does not say anything falls. What is
says is the space-time curvature is such that the moon rotates around the
earth and the earth-moon system rotates around the sun.

> If the earth 'falls' into the sun, the moon should do the
> same thing.

Both the earth and the moon feel the suns gravitation - the earth-moon
system rotates around the sun.

>
> The curvature of spacetime is global. There is no such thing as the
> earth-moon having its own fabric of spacetime independent of the
> sun-earth's. This idea is very different from Newtonian gravity.
> Therefore, this is exactly what Mr. Smith was talking about with that
single
> word remark. That is GR is wrong.

Express your ideas in the language of GR not in some folksy popularist
writing inspired imagery of zero validity.

Bill


.

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