Re: Age of the Earth

On Sun, 15 Jan 2006 13:22:22 -0500, Paul J Gans wrote
(in article <dqe3su$ors$6@xxxxxxxxxxxxxxxxx>):

> ck19bla@xxxxxxx wrote:
>
>> ck19bla@xxxxxxx wrote:
>>> isn't it less than ten years since we found out that light can bends?
>
>> ISN'T IT LESS THAN TEN YEARS SINCE WE FOUND OUT THAT GRAVITY CAN BEND
>> LIGHT? the physics we know now might not hold up in the future. you
>> guys seem to want it to though.
>
> Why post this twice? The answer is no, it has been about a
> hundred years since we found out that light "bends". And it
> has been almost that long since the first of many experimental
> verifications of it were done.
>
> Science is flexible. If better ideas come along in the future,
> you can bet that they will be adopted. That's why we use
> relativity today for astronomical problems and not Newton's
> mechanics.
>
> And why are you shouting?
>
> ---- Paul J. Gans
>

But remember Paul, the new theory always contains the previous theory
in the appropriate realms.

General Relativity reduces to Newtonian gravity in the limit of small
masses and Newtonian gravity reduces to Galilean gravity at distances
small compared to the scale of the gravitating mass.

Similarly, you can demonstrate that F=ma is a solution of the
Schrodinger equation when using averaged (expectation) values.

Because of this, many of the predictions of the older theory are still
valid. Even better is that the old theory usually exhibits some
obvious problems when approaching the limits of its applicability

We still use Newtonian physics for astronomy and space flight unless we
need really high precision measurements (such as the GPS or Gravity
Probe-B).

Tom
P.S. Hope to see you at the DC Howlerfest in April!
--
Dealing with Creationism in Astronomy
http://homepage.mac.com/cygnusx1
cygnusx1@xxxxxxx
"They're trained to believe, not to know. Belief can be manipulated.
Only knowledge is dangerous." --Frank Herbert, "Dune Messiah"

.

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