He became editor of Analog Science Fiction after John W. Campbell's death; after leaving Analog, he went on to edit Omni magazine[?].
He was the science advisor for the failed television series The Starlost, leaving in disgust after the airing of the first episode; his novel The Starcrossed was loosely based on his experiences.
... years after the Big Bang: formation of first galaxies, see Galaxy formation and evolution
5 billion years ago: formation of the Sun
4.5 billion years ago: ...
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