It's not, as demonstrated.
Actually yes. Quite a hefty chunk of my degree
And...?

Go ahead....?
Haven't eaten meat for 32 years.
I'm sorry for your loss.
So "Na'ahh", eh? Riveting! Was Generalized Sweeping Ipse Dixit 'Hand-Wave' Dismissal Baseless 'bare' Assertion Fallacies a
hefty chunk of your 'degree' also?
Lots of evidence supporting a sphere.
Ready(?)...AND...?
Prove it's a contradiction. Empirically.
"
Gas expansion into
a vacuum, mixing of ideal gases or liquids, diffusion, effusion, colligative effects, and osmosis each fundamentally involves an
increase in entropy due to increased dispersion of energy (with no change in total energy in the case of ideal substances) due to a greater number of microstates for the particular system involved."
entropysite.oxy.edu/entropy_is_simple/
Take an empty liter bottle of soda, suck the air out, and replace the cap quickly. Ensure the sides of the container are somewhat collapsed (
denoting a very minor Vacuum). Pound a 3 inch nail through a small sheet of 1/4 in ply wood and lay the board flat on the ground (butted up against
STRONG 'gravity' 
) with the business side of the nail in the vertical position. Puncture the bottom of the bottle with the nail and tell us what happens.....?
Now for my claim: 'Flip the Script' where you have an
Exponentially Stronger Vacuum with
Exponentially Weaker 'gravity'...what do you suppose will happen?
He's talking to you (and your cohorts)...
“
If your theory is found to be against the second law of thermodynamics, I can give you no hope; there is nothing for [your theory] but to collapse in the deepest humiliation.”
Arthur S. Eddington, The Nature of the Physical World (1930), p. 74.
That isn't the case, and you know it.
Another in a
Loooong List of "Na'ahhs".
What stops the atmosphere pouring off the edge?
'Pouring Off' into what, Pray Tell...?
The 'sides' of
The Firmament. There is no 'edge', you can't fall off

And you'll never get close to any alleged 'edge'.
Caveat: I personally cannot Empirically Validate "The Firmament"...even though it's quite strong, it's circumstantial evidence.
I see satellites over my house all the time.
Post a Pic...? SEEING (Observing) is not TESTS (!!) for the Billionth TIME!! What's your "Independent Variable"... your Eyelids in concert with your Imagination and Pre-Conceived Bias?
I am watching TV transmitted from one.
Why? Cause that's what they
TOLD YOU
They also say that:
Ink/Paper/Glue Molecules can Author Technical Instruction Manuals/ Blueprints.
Something can come from Nothing.
Life poofed into existence from Pond Scum.
Among numerous other ground squirrel level reasoning atrocities. I suppose you're FULLY On-Board with those also...?
Funny, my and every 'satellite' dish in the neighborhood is damn near pointing directly towards the horizon (Read: to a ground based "Repeater Tower").
regards