次の英文の下線部を和訳せよ。
In 1968 astronauts retuened with photographs of the earth taken from the moon. These photographs made it celar as never before that the earth is just a sphere suspended in space. It is like a self-supporting spaceship on an eevrlasting jouney. There is no home base to which to return for repairs, more provisions, or disposal of wates; there is just the continuous radiation from the sun.
――福岡大学 工・薬学部(2月8日実施)――94年