nullnullXXX
201X.X.XQuestionQuestionWhat are the names of the eight planets of the solar systerm?Mercury
水星Venus
金星Earth
地球Mars
火星Jupiter
木星Saturn
土星Uranus
天王星Neptune
海王星nullMarsnull Mars is the fourth planet from the Sun in the Solar System. Mars is named for the Roman god of war, presumably because of its distinctly reddish color. MarsnullMarsEquatorial radius ：3397.2km
Quality：6.4219×10^23 kgEquatorial radius ：6372.8km
Quality：5.98×10^24 kgMars' diameter is only about half and its mass about one-tenth the Earth's.null Mars has polar ice caps and clouds in its atmosphere, seasonal weather patterns, volcanoes, canyons and other recognizable features. However, conditions on Mars vary wildly from what we know on our own planet. MarsVolcano on MarsSpring of MarsnullLife on Mars?Among our discoveries about Mars, one stands out above all others: the possible presence of liquid water on Mars, either in its ancient past or preserved in the subsurface today.
Water is key because almost everywhere we find water on Earth, we find life. Pictures of channels probably carved by running water on Mars nullLife on Mars?Colour view of crater with water icenullMars Exploration“Spirit” Mars probe
（勇气号）
Time of Launch: 2003. 6.10
Time of Landing: 2004. 1. 4 “Opportunity” Mars probe
（机遇号）
Time of Launch: 2003. 7. 7
Time of Landing: 2004.1.25NASA：美国宇航局nullMars Exploration“Curiosity” Mars probe
（好奇号）
Time of Launch:
2011. 11.26
Planned Time of Landing:
2012. 8nullProtect the EarthnullTHANKSTHANKS
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