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SESK: Stuff Everyone Should Know · sesk.info/aero-rockets-work-better-in-space

Do rocket engines work in the vacuum of space, where there is no air to push against?

Yes, and they actually work better in space than in air.

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  1. Yes, they work even better in space than in air ✔
  2. No, they need air to push against
  3. Only solid rockets work in space

Why: A rocket pushes on its own exhaust gas, and the gas pushes back on the rocket. It does not need air at all. In space, the exhaust does not have to shove surrounding air out of the way.

Huh, didn't know that: Rockets carry their own oxidizer, so they can burn fuel with no outside oxygen.

The dad joke
Why don't rockets ever need a push from friends? They push themselves.
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References

Answer: Yes, they work even better in space than in air. A rocket pushes on its own exhaust gas, and the gas pushes back on the rocket. It does not need air at all. In space, the exhaust does not have to shove surrounding air out of the way.

  1. NASA Glenn, Rocket Principles www.grc.nasa.gov/www/k-12/rocket/TRCRocket/rocket_principles.html
    As a result rockets actually work better in space than they do in air.
    Checked 2026-10-10.

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