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Explorer 1 lifted off to reveal the Van Allen radiation belts, proving Earth is
Featured Event 1958 Event

January 31

Explorer 1 Launches: America Enters the Space Race

Explorer 1 lifted off to reveal the Van Allen radiation belts, proving Earth is surrounded by a dangerous zone of charged particles that forced engineers to redesign future spacecraft shielding. This discovery immediately shifted space mission planning from simple orbital mechanics to survival against invisible cosmic hazards.

January 31, 1958

68 years ago

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