1958 Prestige — 2 museum-grade prints that set the mood. Sputnik 3 represented the Soviet Union's pivot from propaganda payloads to serious geophysical research — a 1,327-kilogramne laboratory that carried more scientific instrumentation than any previous satellite and operated until April 1960. Its magnetometer and spectrometer data contributed to early understanding of Earth's radiation environment, and its cone-cylinder bus architecture became the template for subsequent Soviet scientific satellites including the Elektron and Prognoz series. Explorer 1 was the first successful US orbital launch on 31 January 1958, responding to Sputnik 1 with a science payload rather than a hollow sphere. James Van Allen's Geiger counter aboard the spacecraft discovered the radiation belts that now bear his name — a finding that shaped radiation shielding for every crewed mission that followed.