so-so
Many millions of years hence, the most evolved form of humans, having learnt that the Sun is about to become a supernova, send back a message to us about the historical and evolutionary path from us to them.
It is a novel of ideas rather than of character or plot since we rarely see individuals rather than historical movements and descriptions of types of human. I found it compelling if somewhat heavy-going at times, but I am so glad it is done
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