European Space Agency. This report contains footage of the Sputnik launch, an interview (and set-up shots) in the private museum of RSC Energia – the company that built Sputnik – as well as interior and drone shots of the Cosmonautics museum in Moscow.

The Sputnik launch ushered in new political, military, technological, and scientific developments and marked the start of the Space Age. This article from NASA provides a general overview of the event and how it impacted the United States.

Sputnik, in 1957, is one of the milestones in this history of U.S. foreign relations in political context, from the Dept. of State, Office of the Historian.

This article from the Smithsonian's National Air and Space Museum provides background on why the U.S. invested and prioritized sending a person to the Moon.