Space
When was Sputnik 1 launched?
4 Oct 1957 AD
The Soviet Union launched Sputnik 1 on 4 October 1957 AD.
1 BC · 1 AD
Context
What happened?
Sputnik 1 was the first artificial satellite placed into Earth orbit. Its simple radio transmitters broadcast signals that could be detected on the ground as the small spacecraft repeatedly circled the planet.
Significance
Why it matters
The launch marked the beginning of the Space Age and intensified competition in science, engineering, and spaceflight. It demonstrated orbital capability publicly and helped accelerate investments that led to crewed missions and lunar exploration.
Further reading
Sources
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