gas - All elements are either solid, liquid or a _______, capsule - The part of a spacecraft in which people travel., balloon - Children have these on special occasions. You blow them up and hang them for decoration., force - A power which causes an object to move or change the way that it moves., barrier - To break the sound , you have to go faster than the speed of sound, atmosphere - The layer of gases surrounding the Earth or other planets., descent - This means the journey downwards from a higher point to a lower point, for example from space to the surface of the Earth., gravity - The force which stops things on Earth floating away. Newton discovered it when an apple fell on his head, engine -  A machine with moving parts that converts power into motion, for example in a car, oxygen - The gas that we need to survive, parachute - People can jump out of planes wearing one because it makes them fall more slowly, helium - A very light gas,

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