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地球少地非正球。地球是宇宙中有生命存在的特殊行星,全球大洋面积约3.62亿平方千米,占整个地球表面积的71%。因此,有“水的行星”之称。地球又是一个两极稍扁、赤道略鼓的不规则的旋转椭球体,极半径为6356千米,赤道半径为6378千米,形状像个“梨”,并非正圆球体。水星水星无水。水星是距离太阳最近的行星。其质量和体积均约为地球的1/20,表面重力加速度只有地球的2/5,它的表面空气极为稀薄,温度(向阳面)高达400℃,水分是无
Earth is less than the ball. The Earth is a special planet with life in the universe. The global ocean area is 362 million square kilometers, accounting for 71% of the total surface area of the Earth. Therefore, there is the name “water planet”. The earth is again an irregular, spheroidal ellipsoid with two poles slightly flat and slightly equatorial drums. The radius is 6,356 kilometers, and the equatorial radius is 6,378 kilometers. It is shaped like a “pear” and is not a perfect sphere. Mercury does not have water. Mercury is the closest planet to the sun. Its mass and volume are about 1/20 of that of the Earth. Its surface gravitational acceleration is only 2/5 of that of the Earth. Its surface air is extremely thin, the temperature (sunny surface) is as high as 400°C, and moisture is no.