Sputnik's legacy – Physics World
How Sputnik Worked
Sputnik design
Sputnik at 60: Read Original 1957 Coverage of Launch | Time
Sputnik | Satellites, History, & Facts | Britannica
Sputnik (rocket) - Wikipedia
Remembering Sputnik - The satellite that began the Space Race - NASASpaceFlight.com
On This Day: Soviet Union launches Sputnik 1 - UPI.com
Sputnik Launched
Soviet Union Launches Sputnik: October 4, 1957 - The official blog of Newspapers.com
Sputnik 1957 hi-res stock photography and images - Alamy
Sputnik and the Space Age | National Air and Space Museum
USSR launches Sputnik-3
Sputnik 1 - Wikipedia
USSR Launches Sputnik
October 4, 1957: The Launch of Sputnik and the Dawn of the Space Age | Aerospace Lectures
The Sputnik 1 Launch: The First Artificial Satellite To Enter Earth's Orbit | Mach | NBC News - YouTube
Sputnik 1 - Wikipedia
The Rocket That Launched Sputnik and Started the Space Race
File:Sputnik 1.jpg - Wikimedia Commons
