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Q:

Can planes fly in space?

A:

Unfortunately, they can't. Planes need lift to fly; but to produce lift, you need air. Since there is no air in space, airplanes cannot fly in space.

 

Rockets are disgned to fly without needing lift: they rely etirely on thrust. While some engines need oxygen to work, it's easy to pack the oxygen along, in the form of a liquid or solid oxydizer. This way they can fly in space, even if there is no air.

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