The rase to the red planet humankind's next big mission is Mars. But how long until we get there?

     
      A18
      Achenbach,J.
      The rase to the red planet humankind's next big mission is Mars. But how long until we get there? J. Achenbach // National Geographic. - 2016. - Vol. 230 No. 5. - С. 30-61. - .