B1.31
James: Do you think humans will ever live on other planets?
Steve: No. I don't think we will be able to.
James: Why not?
Steve: Because there's no atmosphere on other planets.
James: Do you think people will live on space stations permanently?
Steve: No. I think it will cost too much for people to live there all the time. At the moment people live on space stations to do research. That's very expensive and it can be dangerous too.
James: That's true. Take-off and landing are very risky, and you need to do a lot of training to be an astronaut.
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