Re:Alcubierre drive
by swayvil on Monday August 13, 2018 @12:13PM
(#17751173)
I recall a bit of scifi, the title escapes me, where they placed an opaque cloud between our galaxy and Andromeda, to block any form of communication, so they could have FTL without violating causality.
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What you describe is a teeny-tiny bit of a a spoiler. Erring on the side of cation, obfuscating my reply.
The book you're talking about was by Alastair Reynolds. It's the third book in the "Other" section here: https://en.wikipedia.org/wiki/Alastair_Reynolds#Novels.