About the book: 2021 / What could be more interesting than participating in test flights of the latest spacecraft, feeling the adrenaline rush from speeds unattainable until this day? The stage of unmanned testing of the Sapsan transport system has been successfully completed, and now Leonid Kremnev, one of the most experienced cosmonauts of his time, is preparing for the first flight. His flight mission includes only a few points on the map of the solar system where he must deliver relay satellites. The last of these points is far beyond the orbit of Pluto, where, after the satellite is launched, it must head to Earth and return back…