Heinrich Psscht - Windows of Opportunities

This book is about adventures of two astronauts from a distant future. So distant, but so recognizable. There are a hundred stories in it, short as an anecdote and a little longer and more serious. Astronauts are different in age and rank, and they fly from one galaxy to another through the Windows of Opportunity on the assignments of the System. Resourcefulness, common sense and a sense of humor help them overcome all obstacles.