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201 pages, Mass Market Paperback
First published January 1, 1982
The planets are both in eternal light (although they have two light sources, 60 degrees apart).
That the planets have one tidal bulge each, on the inner face.
That docking with a ship in low orbit takes much less fuel than high orbit, or achieving escape velocity. (the narrative makes clear that Piper imagined this to be a factor of 6 to 10, not 1.5 to 2.)