The Mariner 4, the first spacecraft to obtain and transmit close range images of Mars. It took 4 days to transmit the image information to Earth and the spacecraft returned useful data until October 1965, when the distance from Earth and its antenna orientation temporarily halted the signal acquisition. Data acquisition resumed in late 1967 and continued until December 20, 1967.
Source: Wikipedia, holidayinsights.com, National Whatever Day
Photo credit: science.howstuffworks.com
More info on Mars: http://science.howstuffworks.com/mars.htm
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