Spacetravel is nothing new. The first spaceship with a human was sent up1spacein 1961. Since then, people have not only travelled to space,2manyof them have also lived there in space stations for some time.
The Soviet Union (苏联) sent the3space station into spacein 1971. This space station was called Salyut I. It4asa place where people could live while they observed space and did experiments.The first group of astronauts lived there for 23 days. The Soviet Union went onto make six more Salyut space stations. At about the same time, the UnitedStates had5own space station, called Skylab.
Astronauts6inthese space stations for a short time. However, it wasn't until the late 1980swhen the Soviet Union sent the Mir space station that people began to live inspace for a7time.
Living inspace stations seems to be fun, but astronauts face many problems. One of them8food.All the9on space stations are put together onEarth and sent there by space shuttle. Because the food has to last a longtime, a lot of it has to be stored in cans. The space station does not have afridge, but it has a cool room to keep fruit and vegetables fresh. Astronautsalso eat many other foods10dried meat that do not need specialcare.
