Question

how spaceship work as there is no oxygen in space .

i mean how fuel burn without oxygen​

Answer 1

Using a process called electrolysis, which involves running electricity through water, astronauts and cosmonauts are able to split the oxygen from the hydrogen.

Answer 2

Spaceships and engines in space behave according to Isaac Newton's third law of motion: Every action produces an equal and opposite reaction. When a spaceship shoots fuel out one end, this propels the rocket forward — no air is required.