What happens if a balloon is filled with helium instead of air?, What happens if there is no oxygen in a spacecraft capsule?, What happens if gravity is very weak on a planet?, What will happen if the parachute doesn’t open during landing?, What will astronauts do if the engine stops working in space?, What will happen if a spacecraft leaves Earth’s atmosphere?, What would you do if you were inside a space capsule during launch?, If you could experience zero gravity, what would you do first?, If you had a giant helium balloon, where would you fly?, What would have happened if the parachute hadn’t opened?, What would have happened if the rocket engine had failed during launch?, What would have happened if astronauts hadn’t had oxygen in their capsule?

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