Question

if there is air in the space what will happen???

Answer 1

if there is air in the space we don't need to take Oxygen with us anfd aeroplane can Ali fly in the space. Rocket also not need Oxygen for combustion of hydrogen fuel.

Answer 2

The most immediate effect would be the sudden introduction of friction into the former vacuum of space, causing orbits to slow and eventually stop altogether. Here on Earth, everyone would either be crushed under the massive air pressure or flung into space, depending on where they are on the planet. Assuming that the air contains normal concentrations of oxygen, every star in existence would ignite and the universe would become a giant fireball.