To this conclusion came the American astronomer Edwin Hubble, which repeated the experiments predecessors on a much more extensive observational material. In 1929 he said that not only established systematic red shift of spectral lines of galaxies, but also defined the law on which the speed of removal of galaxies from us increase as the distance increases. Thus it was proved that in the world of galaxies there is a Gulf stream, which carries them on outer space.

But why does this fact mean the unsteadiness of the Universe?

The answer to this question involves two levels of immersion into the essence of the considered problem. The first is the most "simple", is based on modern concepts about the nature of gravity, space and time. The second is more complex, affects the root cause of the expansion of the Universe, rather answering the question is not so much how much of why the universe is expanding.

The two levels are essential for understanding the problems which goes back to the philosophical views of Aristotle, Ptolemy, Newton, Leibniz, and Einstein. Building on the past, it will be easier to understand the revolutionary transformation of estestvoznaniya due to outstanding discoveries "period of storm and stress", which were abundant in the entire first half of the XX century.

The history of science testifies, that the inevitability of new ideas, a breakthrough into the unknown, prepared by the logic of development of established concepts employed to explain the increasing number of empirical facts.

So it was with Newtonian mechanics, which is based on the idea of infinitely high speed information transmission and proved untenable in the description of effects at nearly light speed of movement of the particles. It was replaced by the special theory of relativity (str), which replaced the infinite speed of light in vacuum.

So it was with the Newtonian law of gravitation that describe the weak gravitational field. It was replaced by General relativity theory (GRT), tozhdestva gravity with the curvature of space - time and consists relativism HUNDRED.

So it was with the Maxwell theory of radiation, on change which came quantum physics that changed our ideas about the properties of the microcosm.

Actually, on this (yet) completed the construction of the Foundation of modern classical physics, based on the "three whales" - relativism, of relativity and veroyatnostnoi. You can argue about how the architecture of modern physics satisfy aesthetic requirements of a particular researcher, however, its staff could be explained by the currently known phenomena taking place both at the micro and macro levels of the structure of matter.

Applied to astronomy predictions of modern physics a simple - in scales of tens and hundreds megaparsec is just one of the well-known nature of interactions to gravitation - can determine the nature of the motion of celestial bodies in space. Moreover, following the predictions of GR, it can be argued that the gravity of the matter leads to the distortion of space and time, against which the "test particles" - galaxies move by inertia, their paths only outlining reject the properties of space and time depending on the properties of Newtonian absolute space. The fact that galaxies run means that changes the properties of space-time continuum, the process of its expansion, manifested in the Hubble flow of galaxies.

Moreover, in confirmation of this statement can be selected as labels curvature and expansion of the space-time not only galaxies and their clusters - giant complexes, numbering from several to tens of thousands of galaxies. These clusters as a whole are moving in the Hubble flow with the same law the speed increase with increasing distance to them - the expansion of the Universe manifests in the same way for any "test particles", regardless of their weight!