Universe – all existing world, and not having borders in time and space. The earth is one of nine planets that revolve around the sun in very similar orbits on circles. Earth is the third planet from the Sun after mercury and Venus, after Earth comes Mars, ending the inner group of planets . different small size and solid surface. Followed by the giant planets of the outer group . consisting of hydrogen and helium-Jupiter, Saturn, Uranus, Neptune and little Pluto. In the interplanetary space sweep the comets and meteoric bodies. Seven of the nine planets have satellites . they just opened more than 50. The Earth satellite – the Moon is large (fifth largest and first with respect to the mass of the planet) and causing tidal movement, covering the whole Earth from the core to the surface.
The sun and its planets are called Solar system . The diameter of the Solar system 12 billion km from the Sun significantly more Land – in 333 thousand times the mass, and 109 times the diameter. The average distance from the earth to the Sun is 149.6 million km is taken as the astronomical unit to measure distances in the Solar system. If you imagine the Sun the size of the ball (diameter 90 cm), then the Earth would be the size of a pea, which is situated from it at a distance of 98 m. And the last planet, Pluto, velicious pinhead, will be removed from the Sun is 3.8 km away. In the interior of the Sun happen nuclear reaction providing a high temperature (about 6000 °c at the surface and about 10-15 million °c in the subsoil) and the strongest electromagnetic and corpuscular radiation, called solar radiation is the main energy source for all processes on the Earth’s surface.
Clusters of solar systems is part of the galaxy . Our Solar system is in milky way galaxy or simply the Galaxy (with capital letters).
The position of the Earth relative to the Sun is a unique example of wise Solar system and the Universe in General. It is through this position of the planet, its shape and size on the Earth has created an environment for the development of life. If this distance was less, the Earth would be too hot – a boiling liquid would evaporate (as on Venus); at greater distance, the surface of the Earth covered ice. Earth has atmosphere, retarding the flux of cosmic particles and ultraviolet radiation and containing oxygen and carbon dioxide, a heat mode which is the liquid state of water and is acceptable for protein bodies.