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First successful interplanetary mission

First successful interplanetary mission
Who
Mariner 2
What
First
Where
Not Applicable
When
14 December 1962
Mariner 2 (USA) performed a flyby of Venus on 14 December 1962, within 35,000 km of the planet’s surface. Results from the flyby revealed the extremely hot nature of the planet’s surface. Mariner 2, now without power, still orbits the Sun today.