Where it is: 189 million miles (305 million kilometers) from Earth
For thousands of years, humans looked at Mars and wondered what lay on its surface. Fifty years ago this week, we finally found out when NASA's Viking 1 became the first spacecraft ever to land on the Red Planet and transmit images from its surface. It was humanity's first view from the surface of another planet.
Although the spacecraft landed safely at Chryse Planitia, north of the equator, mission controllers still had to wait another 19 minutes for the radio signal confirming success to cross the 212 million miles (340 km) between Mars and Earth.
"I studied the black screen, waiting for that narrow strip that will signal the first few lines of the first picture," he said. "Rocks and sand are visible and — finally at the far right — one of the spacecraft foot pads, a symbolic artifact that stamps our accomplishment with the sign of reality … Time and time again I repeat, 'It's incredible.'"
The first color image taken by the Viking I Lander in 1976. (Image credit: NASA)
The Viking mission consisted of four spacecraft: two orbiters and two landers. Viking 1 was joined six weeks later on the surface by Viking 2, which landed in Utopia Planitia, also in the northern hemisphere. Meanwhile, the two orbiters mapped Mars and relayed data — including more than 52,000 orbital images and 4,500 photographs from the surface — back to Earth.
Viking 1 fell silent in 1982, two years after Viking 2, following a software error during an update. The intrepid spacecraft showed us the surface of another planet for the first time, but whether Viking 1 also found the first hints of life off-Earth remains one of planetary science's most enduring mysteries.
What do you know about the Red Planet? Test your knowledge with our Mars quiz!
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