At different times development of humanity people differently represented the place in physical space of the big world. One of the brightest of the options which reached our days presents the earth in the form of the huge mountain on a flat disk which drifts in the boundless ocean. Today borders of penetration of the person into the big world were considerably moved apart, and now people consider that Earth rushes with a huge speed in infinite space, a name to which - the Universe.
The modern science represents the place of our planet in physical structure of the world thus - Earth together with eight more planets and incalculable number of small space objects rotates around the Sun. It in turn approximately for 250 thousand years makes a revolution around the center of the galaxy. In native to the galaxy of our Sun - the Milky Way - except it about 400 billion more stars with own to planets, their satellites, asteroids, comets, etc. rotate. The massive center which holds stars within the galaxy for an assumption of scientists, is the double "black hole" - an object which nature is still unknown. Its weight has to surpass more than twice the total mass of all combined physical objects of the galaxy.
The number of galaxies, similar ours, hugely, but are not possible to calculate it because of the restrictions imposed by the level of development of the modern equipment. In the visible area called a metagalaxy they were counted already by more than one billion. Galaxies do not rotate around any even more massive object as it would be possible to expect, and scatter in the parties from a certain hypothetical point, though do it not rectilinearly and with different speeds.
Modern scientists placed this conditional point in not less conditional center and assumed that in unimaginably old times (about 14 billion years ago) there was "Big Bang" something, having the infinite density and temperature. The scattering residues of this unknown substrate also formed all that we are able to see in space today - the Universe. However, scientists do not even see many essential objects in the Universe, but assume their existence on the basis of the created theories and indirect signs. Logically developing the theory of a Big Bang it is possible to assume that such initially packed (this condition of the Universe was called "cosmological singularity"), but then the blown-up Universes there are billions too. Not less curious assumptions can be built also about that from where all this undertakes and where, after all, disappears.