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Fourth Planet from the Sun. Distinguished from others by its reddish light. Mean distance from the Sun is approximately 141,500,000 miles. Nearest distance from the Earth is 34,500,000 miles. Diameter 4,200 miles. Revolves around the Sun in 687 days. Rotates on axis in 24 hrs. 37 mins. Possibility of life on Mars has always intrigued observers. Markings once thought to be continents and seas can be seen; some observers have seen long straight "canals". White patches near the poles are probably hoar-frost.
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