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Answer for the clue "Stellar couples sign book in advance ", 8 letters:
binaries

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Word definitions for binaries in dictionaries

Wiktionary Word definitions in Wiktionary
n. (plural of binary English)

Usage examples of binaries.

They measured the flow of matter between pairs of close binaries, and they metered the flux of radiation from the infall of gas around black holes.

Those two were close binaries where no planets could possibly support life, even if planets had existed.