What do you think the a_____ of another planet might be like?, What do you think the atmosphere of another planet might be like?, Have you ever seen a h_____ b_____ in real life? What did it look like?, Have you ever seen a hot-air balloon in real life? What did it look like?, Would you like to travel in a s_____ c_____ one day? Why or why not?, Would you like to travel in a space capsule one day? Why or why not?, What kinds of vehicles use a powerful e_____?, What kinds of vehicles use a powerful engine?, Can you think of everyday examples of f_____ acting on objects?, Can you think of everyday examples of force acting on objects?, How would life be different if g_____ were much weaker on Earth?, How would life be different if gravity were much weaker on Earth?, Why do many balloons use h_____ instead of normal air?, Why do many balloons use helium instead of normal air?, Why is o_____ so important for astronauts in space?, Why is oxygen so important for astronauts in space?, Would you try skydiving with a p_____? Why or why not?, Would you try skydiving with a parachute? Why or why not?, What do you think happens when a plane breaks the s_____ b_____?, What do you think happens when a plane breaks the sound barrier?, What interesting experiments could people do in zero g_____?, What interesting experiments could people do in zero gravity?, What would be the most exciting part of leaving Earth’s a_____?, What would be the most exciting part of leaving Earth’s atmosphere?

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