Pebbles in the sky. Azimov A.

From 1949, Joseph Schwartz fell into the world of a distant future - the heyday of the Galactic Empire.

As a result of ancient thermonuclear wars, the surface of the Earth became radioactive and unsuitable for life. At the same time, people settled throughout the galaxy and forgot about their cradle. The earth is just a pebble in the sky. Now all of humanity lives under the control of the planet Pensor, which controls two hundred millions of stars. But nationalist sentiments are still alive on Earth, some earthlings want to regain their ancestors' power. One of the revanchist groups prepares a weapon that can devastate the entire galaxy. Schwartz at the behest of fate is in the very center of the conspiracy...