The Lies of AiG

[jammycakes (James McKay)]

@Patrick_S

One of us is imagining something. Coalescing. In space. It can’t be done. Every star, galaxy and nebula is moving apart at something near light speed. The further back in time you go, the worse the problem, as there were no heavy elements. How do H and He clump in space going nearly light speed in all directions. It’s not like there was matter in front to turn the atoms into each other.

Look, Patrick, you need to start doing some very basic maths here.

You’re taking the way that gases behave on laboratory scale and assuming that they behave in exactly the same way on a galactic scale. They don’t.

The strength of the gravitational field due to a gas cloud at its edge is given by the inverse square law:

g = \frac {GM} {r^2} \hspace 2em [1]

For a given density, the mass is proportional to the volume, in other words, to the radius cubed. For a spherical gas cloud:

M = \frac 4 3 \pi r^3 \rho \hspace 2em [2]

Putting [2] into [1] gives:

g = \frac {4 \pi G r^3 \rho} {3 r^2} = \frac {4 \pi} 3 G \rho r

In other words, for a gas cloud of a given density, the gravitational force that it exerts at its edge is proportional to its radius. Of course it will start to contract once it gets to a certain size.

Seriously, this is the basics. It’s beginner stuff. It’s the level of physics and maths that teenagers learn at school.