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- 104 What is the purpose of having a countdown during a rocket launch?
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- 39 How does Voyager 1 send signals to Earth?
- 37 What made NASA shut down the Shuttle program?
- 33 Why do the exhaust flames from cryogenic stage engines appear to be separated from the nozzle?
- 31 Why are hydrogen-fluorine fuels not used for rockets more frequently?
- 30 Why do the Shuttle's external tanks appear to be rusted?
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