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SESK: Stuff Everyone Should Know · sesk.info/aero-explorer-first-us-satellite

What was the first successful U.S. satellite?

Explorer 1, launched on January 31, 1958.

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  1. Telstar 1
  2. Explorer 1 ✔
  3. Apollo 1

Why: Explorer 1 became the first U.S. satellite to reach orbit. Its cosmic-ray instrument also helped reveal radiation belts around Earth.

Huh, didn't know that: Those radiation regions became known as the Van Allen belts.

The dad joke
Explorer 1 lived up to its name by finding something new right away.
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References

Answer: Explorer 1. Explorer 1 became the first U.S. satellite to reach orbit. Its cosmic-ray instrument also helped reveal radiation belts around Earth.

  1. Explorer 1 Mission www.jpl.nasa.gov/missions/explorer-1
    Explorer 1 became the first successfully launched satellite by the United States
    Checked 2026-10-10.

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