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  The galaxy is a collection of stars contained in the Universe, galaxies contained in three main forms: ellipticals, spirals, and not one word (irregulars). The space between galaxies is almost empty, except for the intergalactic gas clouds.
  
Galaxy is a system bound by gravity which consists of stars (with all forms of manifestations, including neutron stars and black holes), gas and cosmic dust of the interstellar medium, and the possibility of a hypothetical substance known as dark matter. The word galaxy comes from the language Greek galaxias [γαλαξίας], which means "milk," which refers to the Milky Way (English: Milky Way). The types of galaxies ranging from dwarf galaxies with ten million stars up to a giant galaxy with a trillion stars, all orbit the galactic center. Sun is one of the stars in the Milky Way galaxy, our solar system including Earth and all the objects that orbit the sun.
There might be more than 100 billion galaxies in the observable universe. Most of the galaxy in 1000 to 100,000 parsecs in diameter and usually separated by distances measured in millions of parsecs (or megaparsecs). space between galaxies is filled with gas which has a mass density less than one atom per cubic meter. Most galaxies are organized into a set of so-called clusters, to then form a larger set called superklaster. Larger structure is surrounded by empty space in the universe. 

  besides galaxy, in space there is also a black hole that is still a mystery, here we review on black holes.
Black hole is a concentration of mass great enough to produce a very large gravitational force. black holes can have any size, from microscopic to the size of the observable universe. Black hole is created when an object can not withstand the power of the force of its own gravity. Many objects (including the sun and earth) will never become a black hole. The pressure of gravity on the sun and the earth is not sufficient to exceed the atomic and nuclear power within him that are against the pressure of gravity. But contrary to the object of very large mass, gravitational pressure was the one who wins.
   the mystery of black holes that dot the sky off the strange incident is said to equal the prevailing concept in the Bermuda Triangle, it's just a black hole that can be said even worse because he was able to attract and swallow whatever was nearby, including the planets, not even particles cahayapun able to escape the gravitational pull of black holes are super terrible. The mystery that surrounds the black hole phenomenon, however, can only be studied from afar, because of the ability of science and technology, man is still not able to bring them over to the hole.

  There are many black holes throughout the universe, instead there is a theory that says the Milky Way also has a black hole! So is there any possibility if later the sun and surrounding planets including the earth will be swallowed by the black hole? Currently, the astronomers to answer, no, because compared with black holes in other galaxies it, the nature of black holes in the Milky Way is said was in a state of calm.
  The mystery that surrounds the black hole will continue to attract the astronomers to continue researching it, so get a satisfactory answer. While humans have not been able to explore far into space, then the answer is forfeited and the various theories without proof will continue to put forward to solve the mystery of this universe.

http://en.wikipedia.org/wiki/Galaxy, http://id.wikipedia.org/wiki/Lubang_hitam

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