Venera 3 launched from Baikonur Cosmodrome on November 16, 1965, aimed at Venus with instruments designed to measure the planet's atmosphere and surface conditions. Its communication systems failed before entry, so the probe transmitted no data upon arrival, but its March 1, 1966 crash landing on Venus made it the first spacecraft to reach the surface of another planet, a milestone despite the mission's technical failure.
Venera 3 was part of the Soviet Union's dogged and often frustrating campaign to unlock the secrets of Venus, a planet whose thick cloud cover made it maddeningly opaque to any instrument short of a probe that could survive descent through its atmosphere. Launched alongside its twin, Venera 2, which flew past Venus without entering orbit, Venera 3 carried a sealed landing capsule with instruments intended to radio back data on atmospheric pressure, temperature, and composition.
Somewhere during the four-month cruise to Venus, the spacecraft's communications system failed silently, likely due to overheating that Soviet engineers had not anticipated given wildly incorrect assumptions about Venusian surface temperatures. On March 1, 1966, Venera 3 slammed into the Venusian surface, becoming the first human object to make contact with another planet, but transmitted nothing—a bittersweet milestone, historic and hollow at once. It would take Soviet engineers several more attempts and redesigns, culminating in Venera 7's successful 1970 transmission, before humanity actually heard back from the surface of Earth's hellish twin.