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The burning of the fuel requires oxygen, however, there is no air/oxygen in space? How can the problem be solved?

- Vivien (01.06.2002)

The rocket or spacecraft brings the oxygen needed from the Earth. You do not see a big air balloon in the rocket. The oxygen is compressed in tanks and kept cold in a liquid form. It is released carefully and mixed with hydrogen (or other types of propellant) before ignition.

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LAU Kai-Ip
Asst. Curator, Hong Kong Space Museum
29.04.2003