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Nine Planets of the Solar System ppt-Ji Education Edition Information Technology Sixth Thirteenth Courseware
The 13th lesson of "Nine Planets of the Solar System" ppt Pt. Mercury is 58 million kilometers away from the sun and is the closest planet in the solar system to the sun. Mercury has no moons, and its volume ranks second to last in the solar system, only larger than Pluto. Because Mercury is very close to the Sun, its daytime surface temperature can reach as high as 427 degrees Celsius; and at night it drops to minus 173 degrees Celsius. The surface of Mercury is very similar to the surface of our moon, both composed of rocks and subjected to a violent meteorite impact, covered with craters. The diameter of Mercury is about 4,800 kilometers (the moon is slightly less than 3,500 kilometers). However, Mercury is unique in many ways. It is the largest planet closest to the sun, and its orbit radius around the sun is only 1/3 of the radius of the earth ’s orbit around the sun; the position of its perihelion around the sun ’s orbit is slightly different after each revolution Change ["precession"]-This fact has become an important basis for testing Einstein's general theory of relativity. (The picture was taken by the "Sailor 10" detector in 1974)