Let’s suppose we could dump enough “breathable” air (whatever that means for humans) into the solar system that it filled the spaces between planets.
What would happen?
A - I imagine it would then become possible to fly airplanes between planets, perhaps balloons? Would space travel become easier or harder?
B - According to another lemmy post, we would start to hear sound waves from the sun (A constant jackhammer sound - delightful)
C - Each each planet become the center of some mega cyclone (like the Jupiter storms, but bigger)?
D - At some point the air above us wouldn’t be pushing down onto the earth at sea level, could we survive the additional pressure?
Not exactly. All known means of propulsion are based off of throwing something backwards to propel yourself forwards. In a medium like air, you can grab the air in front of you and thrust it behind you. In space, you don’t have that option, you have to carry all of the propellant with you from the start and can’t get more unless someone brings it with you.