4 October 1957 (launch) / Europe
The first artificial Earth satellite reaches orbit
The Soviet Union launched Sputnik 1 into Earth orbit. Radio signals and orbital tracking opened a new stage in space exploration and observation.
The story
Sputnik 1 launched from Baikonur, in present-day Kazakhstan, on 4 October 1957. Its radio transmitters marked the beginning of artificial Earth satellites, not the first object to reach space or a human spaceflight. Rocketry, communications and tracking required extensive teamwork. Cold War competition coexisted with international networks observing the satellite.
Connections and context
Orbiting instruments enabled sustained study of Earth and near-Earth space. Space capabilities subsequently transformed communications, weather observation and Earth science, joining scientific questions to large engineering programs.
Dates and precision
4 October 1957 (launch) Documented date
Positioned by the documented year, month or day. Missing precision is not inferred.
Representative map location
Moscow (program organization)
The marker represents Soviet program organization in Moscow. The actual launch was at Baikonur in present-day Kazakhstan.
Representative coordinates · 55.7558°, 37.6173°
A marker identifies one representative place, such as a manuscript collection, laboratory or observing site. It does not mean the work happened only there, or assign a shared discovery to one country.
Bibliography
- NASA: Sputnik ushers in the Space Age
- Sputnik and the origins of the Space Age, NASA History
References are listed as plain bibliography titles. They support particular facts or context; a reference does not certify every interpretation in a story.