Vladimir Shreyberg

Soviet Scientist Petrovich pioneers the way to the Sun, but his spacecraft is never heard from again. Later, Andrew's laboratory investigates means of protection from deadly radiation. Andrew repeats Petrovich's journey, and offers his life to rescue an orbiting science laboratory, which holds the solution to the problem.

The picture is dedicated to the work of Soviet medical scientists who studied how stresses that are unknown under ordinary earthly conditions affect a living organism: overloads during exit from the atmosphere, a state of weightlessness, oxygen starvation. Experiments were first carried out on animals: dogs and rats, and later people also participated in the experiments.

Grisha secretly leaves for the virgin lands without his mother’s permission. The young man quickly adapts to the new hardships and soon, despite his age, becomes one of the leaders of the brigade. Grisha’s mother, Pelageya Maksimovna, arrives at the virgin-land state farm to take her son home, but she ends up staying there and, with motherly love, cooks food for the young pioneers of the virgin lands, who become as dear to her as her own son.

At the collective farm’s animal-breeding station, the young naturalists lose a fox named Serebryanka, which has run away. The children ask an old hunter, Mukhtar-aga, to catch the fox with the help of a golden eagle. The hunter agrees. In the duel with the fox, however, the eagle is defeated. Mukhtar-aga is distressed: the bird is no longer fit for hunting. Then the children decide to catch a young eaglet and give it to Mukhtar-aga. Khasen and Sasha set off for the mountains…