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Mars is the fourth planet from the Sun and is commonly referred to as the Red Planet The rocks soil and sky have a red or pink hue The distinct red color was observed by stargazers throughout history It was given its name by the Romans in honor of their god of war Other civilizations have had similar names The ancient Egyptians named the planet Her Descher meaning the red one Before space exploration Mars was considered the best candidate for harboring extraterrestrial life Astronomers thought they saw straight lines crisscrossing its surface This led to the popular belief that irrigation canals on the planet had been constructed by intelligent beings In 1938 when Orson Welles broadcasted a radio drama based on the science fiction classic War of the Worlds by HG Wells enough people believed in the tale of invading Martians to cause a near panic Another reason for scientists to expect life on Mars had to do with the apparent seasonal color changes on the planets surface This phenomenon led to speculation that conditions might support a bloom of Martian vegetation during the warmer months and cause plant life to become dormant during colder periods In July of 1965 Mariner 4 transmitted 22 close-up pictures of Mars All that was revealed was a surface containing many craters and naturally occurring channels but no evidence of artificial canals or flowing water Finally in July and September 1976 Viking Landers 1 and 2 touched down on the surface of Mars The three biology experiments aboard the landers discovered unexpected and enigmatic chemical activity in the Martian soil but provided no clear evidence for the presence of living microorganisms in the soil near the landing sites According to mission biologists Mars is self-sterilizing They believe the combination of solar ultraviolet radiation that saturates the surface the extreme dryness of the soil and the oxidizing nature of the soil chemistry prevent the formation of living
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