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It is impossible to see a black hole directly because no light can escape from them; they are black. But there are good reasons to think they exist. mass of the supermassive black hole in the center of a galaxy and the morphology of the galaxy itself. This manifests as a correlation between the mass of the spheroid (the bulge of spiral galaxies, and the whole galaxy for ellipticals) and the mass of the supermassive black hole. At the center of the black hole and thus at the center of the galaxy is the singularity. The singularity in the black hole is a real point zero of gravity and space--time. Is It a gateway to other space-time and other universes? ersee
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Astronomers who are using the Hubble telescope have found unexpected mysteries. The black hole photo on this page and the 800 light year wide spiral shaped disk of dust feeding it, are slightly offset from the center of the host galaxy NGC 4261. Most astronomers call a black hole black because light cannot escape from it. A black hole's escape velocity is greater than the speed of light. Escape velocity is the velocity that an object, for  example a space ship or a planet needs  to escape from the gravitational pull of another more massive object such as  a planet, a star or a galaxy. Eventhough no light or energy can escape from a black hole, these bizarre objects can still be powerful sources of energy in the universe. If a black hole with the mass of  10 suns is surrounded by a cloud of interstellar gas and dust, the parts of the matter will be far enough from the black hole that it will either escape its gravitational pull or merely go into orbit around it. The Schwarzschild radius is more commonly called the event horizon.The horizon on Earth is the limit of our range of vision caused by the curvature of the Earth's surface. We cannot see what is happening beyond the horizon, in case of the black hole the curvature is of space time itself. In the past years we learned more and more about black holes. They really exist in the universe and in our Milky Way galaxy.



A common type of black hole is the type produced by some dying stars. A star with a mass of about 10 - 20 times the mass of our Sun may produce a black hole at the end of its life. In the normal life of a star there is a constant tug of war between gravity pulling in and pressure pushing out. Nuclear reactions in the core of the star produce enough energy to push outward. For most of a star's life, gravity and pressure balance each other exactly and so the star is stable. However, when a star runs out of nuclear fuel, gravity gets the upper hand and the material in the core is compressed even further. The more massive the core of the star, the greater the force of gravity that compresses the material, collapsing it under its own weight. Astronomers found with accuracy an immense black hole in the milky way galaxy with a mass of more than 2 Million Suns.
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