Many stars like our sun form a galaxy of the Milky
Path. In turn, a spiral galaxy the Milky Way - one of many galaxies
different forms that exist in the universe. It includes more than 100 billion stars.
Because the Sun and Earth are located within our galaxy and we are seeing
its edge as it were, from the middle of the Milky Way seems to be no spiralclusters of stars and
continuous curved stripe that crosses the night sky. The assumption that thelight
arc is composed of clusters of stars, it was Galileo Galilei in the early XVII century.
These stars are too distant from us, so you can see them. with the naked eye
there is little more than 5,000 stars. The Milky Way is disc-shaped with a diameter of about
100 thousand light-years.Planets in the following order from the sun: Mercury, Venus, Earth, Mars,

Jupiter, Saturn, Uranus, Neptune and Pluto. The distances of the planets from the Sun form
regular sequence: the gaps between the orbits of the planets increase with
distance from the Sun.Planets are divided into two groups, differing in mass, chemical
composition, rotation speed and the number of satellites.