Very enjoyable book for the first half with a very believable mission for three interesting astronauts. Author ignores an elephant in the space ship when she puts together two men with one woman. A two year mission and there will not be any thought of sex yet one of the men is divorced and the lady is widowed. Last part of the book drags due to the constant asides to deal with the family members and their very petty problems. The great explorers of the 12-1700 era used to disappear for years on their sea voyages and treks and that is the price families pay when connected to great explorers-it is dangerous and time consuming get used to it already!