The galaxy, or the star island, in fact represents the huge congestion of stars which is forming a special gravitational system and having a certain center, peculiar sleeves and the symbolical periphery, or a rare star cloud. The word "galaxy" came from the Greek name which named our system, it sounds as "a dairy ring".
Views of galaxies
Huge telescopes gave to mankind hope that people not some in this huge Universe. They allowed to observe behind unknown galaxies which there are about 50 thousand billions today, to give them a certain classification, the name, possible characteristic to their age and structure. As a result of observations of the galaxy divided by types:
- spiral; - elliptic;
- disk; - dwarfish; - lenticular; - shapeless, not having accurately expressed structure and considered as the certain germs reminding our Universe at early stages of the development. Besides, scientists managed to determine the conditional mass, brightness and speed of rotation of some especially important galaxies. It was succeeded to prove also the fact that galaxies prefer not lonely wandering, they not only are distributed in space unevenly, but also, as a rule, accumulate in groups.
Our Milky Way having a diameter more than one hundred thousands special astronomical units, light years also enters one of groups of galaxies under the conditional name Local.
Galaxies come nearer, move away, born and die that gives the chance to reflect that the Universe does not stand still she leads the mysterious life, constantly forming all new systems.
Space secret
The majority of galaxies is hidden from visual observation for this reason it is necessary to think that the real number of the operating galaxies is much more high, than it is known today. For calculation of their quantity the most exact method the extrapolation method, that is definitions of number of galaxies on rather small site and comparison of the received quantity with all visible heavenly space is considered today.
Existence of galaxies, similar ours, gives also to mankind real hope for existence of the systems reminding solar, so, quite perhaps, filled with intelligent life.
The galaxies most known today which became subject to close attention of mankind are such galaxies as the Fog Andromedy and Magellanic islands. And both were the most unusual and unexplored, and there are galaxies which part certain dark matter which, as it turned out, is possible for finding only at emergence of gravitational interaction is.