The space age began on October 4, 1957 - the day when the Soviet rocket launchers put the first artificial object into orbit. They called it "Satellite", and this name is forever entrenched in the languages of the peoples of the world. The historic launch predetermined the development of space exploration for decades to come. But what if the Americans were the first to launch their satellite into space? How would the history of the world change? Who would be the first cosmonaut? Who would be the first to set foot on the moon? Who would fly to Mars?.. Anton Pervushin is known as a historian and popularizer of cosmonautics. In the story "The sky must be ours!", he acts as a fiction writer, representing an alternative and completely unusual history of the world and space.