Quote (card_sultan @ Jul 5 2016 09:29pm)
How can you ignore accelerations if we need a magical force to defy them but a simple hot air balloon or the force of touching something offers enough force or strength to resist it?
If Newton said F = MA, but the resistance of said force can be achieved with an almost imperceivable amount of resistance - how can you still believe in the force. You're trying to use science to prove something but dont realize in the same breath your actually disproving it and just convincing yourself of that which makes no sense.
It's you who doesn't understand about F=ma. the gravity from the sun essential acts on all the particles of the earth/us with the same force, but because the earth is composed of a lot more matter it experience a far greater overall force. We as individuals don't need to experience that total force to go around at the same speed, all we need is the acceleration which is inversely proportion to our mass a=F/m.
You might think of these massive circles and speeds but the forces involved aren't that great, we're already moving at the high speed required to make the long trip and all that's needed is the acceleration towards the center required to change the angle we're moving at by 360 over a long time.
The acceleration from the earth might be a lot compaired to the other ones we experience but as we are relatively small/light the total force on us isn't that much, so yes a hot air balloon is enough to counter this force and provide a reverse acceleration
If you wanted to make a hot air balloon to move the earth out of orbit around the sun that would be a different story. Even though the acceleration is much less the earth's mass is much lager still so the force required is ridiculous more.
As for expanding into the universe that happened 13 billion years ago, there is a difference between velocity and acceleration, also that's the universe expanding not us moving through space at that speed which would case problems (even in a near vacuum there's a few particles around etc which causes issues at relativistic speeds)