"Proctor had banished Solar system life from any moon or planet other than Earth. On Mars it had disappeared, though, 'the development of higher forms of life may have been less complete than on our earth'. Jupiter lay in wait. Lifeless still, it was evolving an enabling habitat, one that would embrace 'creatures far higher in the scale of being than any that have inhabited, or may inhabit, the earth. For Proctor, in time even the Sun will harbour life."