Even in antiquity, sailors knew how to navigate by the stars. At that time, astronomical navigation was the main method for determining the coordinates and courses of ships. Thanks to this, devices such as the quadrant and sextant appeared. It was with the help of these primitive instruments that the Danish astronomer Tycho Brahe was able to compile an accurate star catalog in the 16th century. Now astronomers are helped by thousands of telescopes on Earth and dozens in space. They study the Universe in a wide variety of ranges: optical, X-ray, infrared, ultraviolet, microwave. And their number is growing every year. In this issue about space navigation today, galaxy clusters, neutron stars, black holes, event horizons, pulsars, dark energy, the expansion of the universe.