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Moon : the satellite

 

Moon , the oldest satellite of the Earth.


                                Moon

The moon is the easiest, celestial object to find in the night sky--- when it's there. Earth's only natural satellite hovers above us bright and round until it seemingly disappears for a few nights. The rhythm of the moon phases has guided humanity for millennia--for instance, calendar months are roughly equal to the time it takes to go from one full moon to the next.

Fig:2         Moon changes our size


Though a satellite of Earth, the moon, with a diameter of about 2,159 miles(3,475 km), is bigger than Pluto. (Four other moons in our solar system are even bigger.) The moon is a bit more than one - fourth (27percent) the size of Earth, a much larger ratio (1:4) than any other planets and their moons.

Fig:3 A picture of earth in the surface of                moon


Atmosphere of the moon

The moon has a very thin atmosphere, so a layer of dust-- or a footprint - can sit undisturbed for centuries, And without much of an atmosphere, head is not held near the surface, so temperature vary wildly. Daytime temperatures on the sunny side of the moon reach 273 degree F (134 C); on the dark side it gets as a cold as minus 243F (minus 153 C).

• Average distance from Earth: 238,855miles (384,400 km).

•Perigee (cloeset approach to earth):  225,700miles (363,300 km).

•Apogee (farthest distance from Earth): 252,000miles (405,500 km).

•Orbit circumstances:1,499,618.58miles (2,413,402 km).

•Mean orbit velocity: 2,287mph (3,680km/h)


Fig:4     A person inception the moon                          surface




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