Re: What Atheists Can't Answer

In article <46B163B4.C90DACF4@[EMAIL PROTECTED]
>,
 Rich Travsky <traRvEsky@[EMAIL PROTECTED]
> wrote:

> Hugh Gibbons wrote:
> > 
> > In article <46AC2920.F170A1D9@[EMAIL PROTECTED]
>,
> >  Rich Travsky <traRvEsky@[EMAIL PROTECTED]
> wrote:
> > 
> > > Bye bye for everyone. The planet will be destroyed.
> > >
> > > RT
> > 
> > I see no reason to think the planet would be destroyed.
> 
> The will become a red gas giant whose diameter could expand as far as
Earth's
> orbit. Plus, some stars in this class can go nova.

I realize that.  Let's think a little bit about what the density of a 
solar mass expanded to 100 million miles in diameter would be.

Ms = 2x10^30 kg.

1 AU = R = 1.5*10^11 meters.

V = 4/3 *pi* R^3 = 1.4x10^34 m^3

That makes the AVERAGE density of the expanded sun about 0.14 g per 
cubic meter.  The much thinner part out where the Earth is will be
just a fraction of that.  

The Earth will be running into that very thin medium very fast, though, 
about 15000 m/sec.  Each second, therefore, each square meter of the 
Earth's cross section (approximately) will be decelerating 0.00014 kg of 
mass by 15000 m/sec, which delivers a 2kg-m/sec impulse to the Earth.  
You'd feel that wind, for sure, and it would be damn hot.

Multiply that by the cross section of the Earth (1.3x10^14) and you get
an impulse of 2.6x10^14 kg-m/sec of impulse each second.  So each 
second, this would slow the earth down by 

2.6x10^14 kg-m/sec / 2x10^30 kg = 1.3x10^-16 m/sec.  

In a whole year, it would slow down by 4x10^-9 m/sec.  In a billion 
years, that'd slow us down by 4 meters per second.

When the sun shrinks into a white dwarf at the end of its stellar 
lifetime, the Earth will still be orbiting it, with a mass and velocity 
not much different than they are now.

Unless I made a huge math error, which is possible.