Question

Why do rocket engines burn in space where there is no oxygen?

Answer 1

Since there is no air and space, rockets need to take oxygen with them into space.  Inside the rocket's engine, fuel and oxidizers are ignited in the combustion chamber, creating hot, expanding gases.  That gas has pressure, and it pushes harder against the top of the rocket than the bottom, making it go up or forward.  Since the fuel is burning, exhaust is released out the bottom.  You can check out an example of how the Saturn V rocket engine works in this

Answer 2

$<b>$Here is the answer to your question!!

Oxygen is required for burning, weather in space or on earth.

On earth oxygen is provided by the air, which contains about 21% of the gas .

But in space where there is no air, oxygen has to be carried from the Earth, in the form of liquid oxygen, as in cryogenic rocket engines, or in the form of compounds known as oxidisers which supply oxygen through chemical reaction, and in solid propellant rockets.

Rocket carries both fuel and oxidiser so that it can burn the fuel and fly in the vacuum of space where there is no atmosphere or air to supply oxygen.

HOPE IT HELPED!!