universe is composed of a large number of celestial bodies.Every night we can contemplate the stars in the sky that seem to be very small, although this is not so.In fact, some of them many times greater than the sun.It is expected that around every single star planetary system formed.For example, near the Sun formed the solar system, consisting of eight large and small and dwarf planets, comets, black holes, cosmic dust, and others.
Earth - space body, because it is a planet, a spherical object that reflects sunlight.Seven other planets and we are only visible because they reflect light from the star.In addition to Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, which until 2006 was considered as a planet in the solar system as a huge number of asteroids, also known as minor planets.Their number comes up to 400 thousand, but many scientists agree that there are more than a billion.
Comets - is also celestial bodies moving along elongated paths approaching and at certain times of the sun.They consist of gas, plasma and dust;acquiring ice reach a size of tens of kilometers.Approaching the star, the comet is gradually melting.From high temperature ices evaporate, forming a head and a tail that reaches amazing proportions.
Asteroids - a cosmic body of the solar system, also called minor planets.Their main part is concentrated between Mars and Jupiter.They consist of iron and stone, and are divided into two types: light and dark.The first of these is easier the second - harder.Asteroids are irregularly shaped.It is assumed that they were formed from the remnants of cosmic matter after the formation of the major planets, or are fragments of the planet, are located between Mars and Jupiter.
Some cosmic bodies and drifted to Earth, but passing through the thick layers of the atmosphere are heated by friction and break into small pieces.Therefore, our planet fell relatively small meteorites.This phenomenon - it is not uncommon, fragments of asteroids are found in many museums around the world, they were found in 3,500 places.
In space, there are not only large objects, but tiny.For example, it calls meteoroid body size up to 10 m. Space Dust and even less, up to 100 microns.She appears in stellar atmospheres due to gas emissions or explosions.Not all celestial bodies are studied by scientists.These include black holes, which are in almost every galaxy.They can not be seen, it is possible only to determine their location.Black holes have a very strong attraction, so they do not even let their light.They annually absorb huge amounts of hot gas.
Space bodies have different shapes, size, location in relation to the sun.Some of them are combined in separate groups, they are easier to be classified.For example, asteroids located between the Kuiper belt and Jupiter, called Centaurs.Between the Sun and Mercury are supposed to be located vulcanoids, although no object has not yet been found.
