Robert Silverberg's To Open the Sky (1967) combines five pre-planned stories originally published in Galaxy magazine in 1965 and 1966, it is an interestingly structured piece of work published at a time when Silverberg was just entering his own personal golden age. It also combines themes of religion, psychic powers, terraforming, immortality, and political conflict into a unique take on the "future history" subgenre of SF.

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