Galaxy is a vast system consists of stars, gas and dust, the auspicious star clusters, nebulae, and sky. "The galaxy is one element of the universe was born, when about 18 000 million years ago. About that the universe has a galaxy to 100 000 million system, in the heart of the galaxy, which has very high gravity, astronomers believe that this is The black hole (Blank Hole), which are believed to have infinite depth. Things when I couldn"t get out of it.
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