if there was air in space space men would not need suits and oxygen
No, or at least not enough. That's why there is no sound in space. There are no air particles for the soundwaves to move.
Propellers rely on air or water to generate thrust, but space is a vacuum with no air. In space, vehicles use thrusters that expel propellant in the opposite direction to move forward. This method follows Newton's third law of motion.
A hovercraft.
Well the plane is flying through the air not through space. It is the pressure differential on the airfoils that make the plane move through the air.
Because propellers require air to actually do anything and last time I checked, there's no air in space.
As you move higher in the atmosphere, the space between air particles increases. This causes the air to become less dense, resulting in lower pressure and thinner air at higher altitudes.
Basically a jet can move in air-space. The reason why it doesn't is that jets don't have high enough cold protection on air leakage protection. But if you protect jets enough you can in go in open space. Another question will fuel...
sound waves can not travel through space since they use the air around us to move.
Sound can only move through matter. For example, when you speak, the vibration of your vocal chords create vibrations in the air, and each vibrating air molecule causes adjacent air molecules to vibrate, and those air molecules make other air molecules vibrate, and so on as the air "propagates" the sound waves. Space is a vacuum, so sound cannot travel through space.
No, sound waves require a medium (solid, liquid, or gas) to travel through, so they cannot move through the vacuum of space where there is no air or other material. In space, sound waves cannot propagate because there is no medium to carry the vibrations.
No, there is no air or atmosphere in the vast empty space between planets in our solar system. Space is a vacuum, meaning it is empty of gases and molecules. The thin atmosphere around planets like Earth fades into space as you move away from the planet.
Scientist classify waves by moving through a medium and/or empty space. For example, a wall, air, water, space.