Space elevator

Space elevator. People use rockets to get into space. It is not cheap. The rockets are heavy. They need a lot of fuel to lift off. It cost millions of dollars to get to the moon or Mars for a long time. Scientists are thinking about space elevator. The elevator uses the earth's gravity but people don't have the right materials in technologies to build it. No material is strong enough. One idea is to you couple nanotubes. This material looks like it is many carbon atoms together, carbon nanotubes are stronger than other materials. But there's a problem, millions of objects by in the atmosphere. Even if people build the elevator, these objects will probably damage it.