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No how will it run in space then
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its fuel will have oxygen in it
it doesnt need outside oxygen
No, it does not require.

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.A rocket engine requires no outside oxygen to operate.They have both oxidizer and fuel.Rocket engines produce thrust by the expulsion of exhaust which has been accelerated to a high-speed. The exhaust is usually a fluid and nearly always a gas which is created by high pressure (10-200 bar) combustion of solid or liquid propellants, consisting of fuel and oxidiser components, within a combustion chamber.So it's totally wrong that rocket engines need air 2 burn
I answered the same thing in a short and sweet way thats all.
what is its composition then ?
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