Since ancient times the Moon was for the people very mysterious. Why she comes to replace the Sun shines all around, but not evenly each day, and change throughout the month? The shadow appears after the Moon has passed the stage of a full moon, and every day the area of the moon decreases. In the end, you can see the very thin sickle, and then for a few months and he disappears. But not for long. The mysterious nature of moonlight found its explanation. The moon shines in the night, not as bright as the Sun during the day, but still making the objects distinguishable. She is not a star and does not emit light itself, but may reflect the foreign light. If one side of the Earth is illuminated in bright sunlight the other is in shadow, but the Moon reflects the light that falls on her, illuminating thereby the earth's surface. The moon revolves around the Earth, and that, in turn, turns around the Sun, therefore their relative position is changing daily. When the entire half of the moon lit by the Sun, visible from Earth – it's a full moon. If the Moon is directly between the Sun and Earth, it reflects nothing and it is not visible, it is a new moon. The moon has no atmosphere, which would help to keep her more or less constant temperature. When one half of it illuminated by the Sun for two weeks, then the surface is heated more than 100 degrees Celsius. Then comes a moonlit night, when some part of the moon, the light does not fall at all, then the temperature there falls to -200 degrees Celsius. The observer from Earth will seem that the Moon illuminates the Earth by night, but also the converse is true. When the moon misses the sun, the light reflected from Earth, just its lights. There is a famous expression: the dark side of the moon. It does not mean that one half of the satellite may not reflect the light. The reason is that the Moon also rotates on its axis so it always faces the Earth only on one side. People long wondered what is on the other side of the moon, but when space travel was developed, managed to photograph the image of the reverse side. Despite the fact that it seems that all the riddles of the moon, mankind decided, on a moonlit night people still possessed a special mood, forcing to forget about everything that is known about this space object science.