The Importance Of Astronomy

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Introduction:
Astronomy is derived from infancy of human culture--- ancient age. People pay more attention to observe sun, moon and star by positioning their location and making calendar in order to indicate direction, ensure time and season. In some point of view, astronomy is one of the most old subjects in Neurology. Sun, as one of the most vital origins that providing light and ultraviolet rays, is actually an very huge galaxy, its cycle was found by a amateur astronomer, Henry Schwab. In 2010, America SDO detector has foretasted the influence the movement of Sun to Earth. Moon is a solid satellite encircled Earth. The one is the closest celestial body and have a profound relationship with Earth, its age has already been 4.6 billion years. …show more content…

The mean thickness of outermost lunar shell is nearly 60-65 kilometers. 100 depth under the shell is lunar mantle, which occupied most volume of Moon. Afterwards, lunar core hides under its mantle, which has very high temperature of 1000 degrees. The average diameter of Moon is about 3476 kilometers, which is 3/11 of Earth and 1/400 of Sun. When it comes to its volume, it only account for 1/49 and the quality is also 1/81 of Earth, which is 7350 tonnes.

Temperature:
Due to the fact that lack of air in Moon with low thermal capacity and conductivity of lunar substance, the temperature between day and night has change a lot. In day, the temperature can be positive 127 degrees centigrade when sunlight irradiate with vertical. However, it is probably minus 183 degrees centigrade in the evening. Those statistics only show the temperature of lunar surface. Therefore, lunar soil temperature can be measured by radio detectors, it proves that there are little changes in soil, that is why the themal conductivity is so low.

Lunar …show more content…

When the sun is acute, especially the solar flare, sensitive X rays, ultraviolet rays and so on from sun make the ionosphere’s D level be more thicker, which enhancing long wave, however, the short wave reflected by E and F level has attenuated because of strong absorption by D level. Time later, the energetic particle solar flare produces arrives the earth, it towards geomagnetic poles because of earth magnetic field, therefore, it influences ionosphere and causes interference of radar and radio communication in high latitude

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