in space,nothing has weight. this means astronauts need special things to help them live there. instead of sleeping in ordinary beds, astronauts sleep in special sacks strapped to the wall, so they do not float around. they eat from special trays which are strapped onto their legs. these trays hold plastic containers of food. astronauts wear special clothes with lots of big pockets to hold things they need for their work. they have to use special exercise machines for an hour every day. if they did not do this, they would get very weak because they weigh nothing in space. astronauts work hard, but they also have a lot of fun playing with things floating around inside their spaceship.