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Rays Astronomy Journal January 2nd - This week I will be studying at this site I will begin studying the moon httpwwwaardvarkoncaspacehtmlmoonhtml Defining the Moon The Earths only known natural satellite shining by the suns reflected light revolving around the Earth from west to east in about 295 days with reference to the sun or about 273 days with reference to the stars It has a diameter of 3475 km 2160 miles and a mean distance from the Earth of about 384000 km 238700 miles 3rd -The moon is an airless spherical rock about 14 the size of the Earth The moon has had a violent and turbulent history Most of the craters on its surface were caused by meteoroids crashing into it about 3-4 billion years ago The darker shades of the moon are called maria seas These were caused by underground lava that flowed to the moons surface 4th - The Moon is much smaller than the Earth and so it has a weaker gravitational pull When the USA sent astronauts to the moon they had to be weighed down to help them walk It is gravity that causes ocean tides on the Earth to rise and fall The gravity of the Sun and Moon pulls the Earths oceans into bulges The Earth rotates beneath these bulges causing two high tides per day 4th -Phases of the Moon The Moons surface is covered with craters ridges mountains and valleys The dark maria are the smoothest parts because of the lava that created them flowed over andcovered old craters The biggest Moon crater that can be seen from Earth is called Bailly Its about 290 km across Where did the Moon come from The Moon Earth are roughly about the same age Several theories have been discussed The Moon Earth formed together from the same dust and gas cloud
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