Until the very latest moment of his existence, man has been bound to the planet on which he originated and developed
Now he had the capability to leave that planet S1
_______ and move out into the universe to those worlds which he has known previously only directly
Men have explored S2
_______ parts of the moon, put spaceships in orbit around another planet and possibly within the decade will land into another S3
_______ planet and explore it
Can we be too bold as to S4
_______ suggest that we may be able to colonize other planet S5
_______within the not - too - distant future
Some have advocated such a procedure as a solution to the population problem: ship the excess people off to the moon
But we must keep in head the billions of dollars we might S6
_______ spend in carrying out