Mariner 11 never sent radio pictures from Mars because it was not a mission that existed. The Mariner program had missions up to Mariner 10, which sent back images of Venus and Mercury.
Pluto was the only planet not visited by a space mariner space probe.
It was launched in November the 3rd,1973 and it was going to Mercury.
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Mercury was studied by the Mariner 10 Probe and has a crater pitted surface.
The Mariner 2 space craft was sent to Venus.
They were the Mariner 1 and Mariner 2 spacecrafts.
The space mission, the mariner 2 was first launched in 1962
Mariner 2
The Mariner 2 spacecraft inspected Venus in late 1962.
The mariner spacecraft explored Mercury, Mars, and Venus. The first successful space probe and first spacecraft visit to a planet was Mariner 2.
the name of the first spacecraft to first observe venus was venera 3. The year it observed venus 1962.
Mariner 2
August 27, 1962
Basically the answer is "Venus". Mariner 2 flew past Venus. Pioneer 5 explored the space between Earth and Venus.
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None of the Mariners actually landed on Venus. They were "fly-by" missions. Mariner 2 reached Venus in December 1962 and Mariner 5 in 1967. In 1973, Mariner 10 passed Venus and used the planet's gravity to alter its course and continued on to Mercury.