The mapping of Mars’ surface began.
Mariner 9 started mapping over 85% of the surface area of Mars on this day.
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NASA declared the conclusion of the Phoenix mission after contact was lost with the Phoenix lander.
A SpaceX Falcon 9 rocket ferried a US National Reconnaissance Office payload into orbit.
NASA's Dawn probe became the first spacecraft to orbit a dwarf planet.
NASA's Mariner 10 became the first spacecraft to reach Mercury.
Soviet Space Program's Vega 1, which was launched on December 15, 1984, released a space probe to enter Venus.
