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  • Why do Nasa and Esa want to wait until the 2030's ?
    ??
  • what does the writer say the journey to Mars wouldn't be so bad?
    ??
  • Why do some people think it is easy to travel to the Moon again?
    ??
  • In what ways is Mars similar to the Earth?
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  • What is the difference between manned and unmanned mission?
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