Topic 3

Hello, every one know something about space. Space- is synonymous with the univerce. He is endless. This fact often frightening people and the are eager to explore it.
They are building space-crafts for flights, making speshel devices for observations...
So, how spase affects peoples lives? 
Cosmic environment exposes the Earth is constantly exposed to visible and invisible.

First of all, the danger comes from the sun. Huge impact on our planet have a flash on it. At such moments, especially in space thrown a lot of solar energy. On Earth, this leads to magnetic storms, severe thunderstorms, frequent auroras and the large amount of precipitation, an increase in the number of different microorganisms and deterioration of health. 

Second- is meteorites. 
Meteorites reaches the Earth's surface in the form of melted rocks and meteors burn up in the atmosphere, turning into gas and dust. Upon impact of large meteorites on Earth's surface there are impact craters with a diameter from a few meters to several hundred kilometers. The biggest and the oldest meteorite craters - Vredefort crater in South Africa. It has a diameter of 250 kilometers, and was about 2 billion years.