Mercury

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Laolee Xiong

Period 2

2/26/97

MERCURY

        

         atomic number 80 is the closest satellite to the sun. Its average distance from the sun is approximately fifty-eight integrity thousand million km and its diameter is 4875 km, making it the second sm each(prenominal)est planet in our solar system. Its volume and mass atomic number 18 about 1/18 that of the earth and its average density is approximately sufficient to that of the earth. Mercurys magnetic field is one-hundred times weaker than that of Earths. Mercury has the shortest revolution of all the planets in our solar system and revolves around the sun in about eighty-eight days. Radar observations of the planet show that its stream of rotation is 58.7 days, or two-thirds of its period of revolution. That means that Mercury has one and one-half days in its year.

        Mercury doesnt have an atmosphere, just it does have a thin layer of helium. The helium is genuinely solar wind that is trapped by Mercurys weak gravity. Scientists cypher that collisions with protoplanets early in the history of the solar system whitethorn have stripped away lighter materials, making Mercury a very dense planet with an iron karyon extending outwards 4/5 of the way to the surface.

        Mercury bares a very similar resemblance to our moon because it has a fortune of craters. The craters, which cover seventy-five percent of Mercurys surface, were formed by enormous rocks that smashed into the planets surface. The largest crater is called the Caloris Basin and it is 1400 km in diameter and is flooded with molten lava. Mercury also has many cliffs that are usually over 300 miles long and two miles high. The quell of the planets surface is smooth and may have been formed by lava flowing out of cracks in the surface.

        Temperatures on...

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