A collection of short stories by Elizabeth Moon. I like Moon's stuff - she's a workmanlike writer who infuses her military and personal experience into her writing for a gritty, realistic feel. But this is not such a good collection. It has the feel of a bunch of leftovers thrown together instead of a proper meal. There was no stand-out; it just sort of plodded along. Her books are really much, much better. She's not really successful at characterization in these shorter works.
In addition, all the stories in this book were re-issued in another collection of her work, Phases, so Lunar Activity is a total waste of time.