A sequel to "Double Planet". The moon has been colonized for more than 1000 years, but now the comets have stopped coming and the atmosphere is slipping away. Only one young girl holds the secret that can return the comets - but first she needs help, and Earth is the only place to find it.
John R. Gribbin is a British science writer, an astrophysicist, and a visiting fellow in astronomy at the University of Sussex. His writings include quantum physics, human evolution, climate change, global warming, the origins of the universe, and biographies of famous scientists. He also writes science fiction.