Scientifically impossible... outer space vacuum
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Ok so you don’t know what buoyancy is, good to know I can disregard your non-sense
So if I know what buoyancy is you suddenly going to start listening to me?
Supposedly gravity is strongest at the gravitational center, so if gravity cannot pull helium down at the surface of earth, it will not be able to pull down helium up in the atmosphere, helium is not gaining any weight the farther up it gets.
Something is wrong with your model, you just don't want to admit it.
Gravity is a neutral force at the “absolute center” of the Earth. If you ever could occupy that point, in theory, you would experience no acceleration due to gravity (you would be weightless). True story
In this specific case, you have laid out nothing wrong with the standard model. Helium (for balloons etc) is harvested from the ground, where it is kept under pressure. If any helium makes it to the surface, it will, through buoyancy, eventually leave the atmosphere.
https://en.m.wikipedia.org/wiki/Outgassing
Great we are in agreement then. Gravity has zero effect on helium molecules.
Not quite, it just has more effect on O2 and N2 (far larger) molecules than He molecules (far smaller).
Thus the heavier molecules are held closer to the surface, and the smaller molecules, through buoyancy, settle near the top of the atmosphere. But what’s this...gravity is weaker at a distance, and weaker on lighter molecules, and thus the helium at the top of the atmosphere can outgas.
Does that make sense or do you need a youtube video meant for children?