THE MOON IS THE EARTH'S only natural satellite. It is relatively large for a moon , with a diameter of about 3,470 kilometre s-just over a quarter that of the Earth. the moon takes the same time to rotate on its axis as it takes to orbit the Earth (27.3 days) and so the same side (the near side) always face us. However the amount of the surface we can see - the phase of the moon-depends on how much of the near is in sunlight. The moon is dry and barren , with no atmosphere and water. But now scientist tells that they found the presence of water in the moon. It consist of mainly of solid rock, although its core may contain molten rock or iron. The surface is dusty, with highlands covered in craters caused by meteorite impacts, and lowlands i which large craters have been filed by solidified lava to form dark area called maria or "seas" . Maria occur mainly on the near side, which has a thinner crust than the far side. Many of the craters are rimmed by mountain ranges that form the crater walls and can be thousands of metres high.
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