What is the black hole in the end?.

<P Align=center> </ P> <P align=center> black hole is like this? .</ P> <P align=center> still look like this? .</ P> <P align=center> </ P> <P align=center> objects near the black hole is attracting </ P> <P align=left> "black hole" it is easy to imagine the words too literally as a "big .black hole ", does not. .The so-called "black hole", is such a celestial body: it's gravitational field is so strong that even light can not escape. .</ P> <P align=left> According to general relativity, gravitational field will bend space and time. .When the star of great size, its gravitational field on space-time had little effect on the surface from the star made a point of light can move in any direction along a straight line shot. .The smaller the radius of the star, its surrounding space-time bending the greater the angle of the light emitted towards some will return to the stellar surface along the curved space. .</ P> <P align=left> small radius of such stars to a specific value (in astronomy called "Schwarzschild radius"), the even light emitted perpendicular to the surface were captured. .By this time, the star becomes a black hole. .That it was "black" refers to it as a bottomless pit of the universe, if any substance to fall into, "seems" to no longer escape. .In fact the black hole really is "invisible", and wait a minute we talked about. .</ P> <P align=left> So, how black holes formed? .In fact, as with the white dwarfs and neutron stars, black holes may also come from the stellar evolution. .</ P> <P align=left> we have a more detailed description of the white dwarf and neutron star formation. .When the aging star, its thermonuclear fuel has run out of the center (hydrogen), the energy produced by the Centre is running out. .Thus, it would not have enough strength to take on enormous weight of shell. .Therefore, under the weight of the shell, the core began to collapse, until the formation of small, dense stars, and pressure have the ability to re-balance. .</ P> <P align=left> smaller mass stars evolve into white dwarf primary, the quality of the larger stars are likely to form a neutron star. .According to the scientists calculated the total mass of the neutron star can not exceed three times the mass of the sun. .If you exceed this value, then there is no force Jiangzai own gravity to contend with, and thus triggering another Big Crunch. .</ P> <P align=left> this, according to scientists suspect, the material will not stop the march toward the center until a volume tends to zero, the density tend to infinity "point." .When once the shrinking its radius to a certain extent (Schwarzschild radius), just as we described above, as a huge gravitational pull makes even light can not shoot out, which cut off all contact with the outside world star - " .black hole "was born. .</ P> <P align=left> compared with other celestial bodies, black holes seem too special. .For example, the black hole of "Invisibility", one can not directly observe it, even the scientists can only guess it put forward various internal structures. .So, how to make their own black hole is hidden it? .The answer is - the curved space. .We all know that light travels in straight lines in the. .This is a basic common sense. .However, according to general relativity, space is curved under the action of the gravitational field. .At this time, the light while still along the shortest distance between any two points spread, but the walk is not linear, but curves. .Figuratively speaking, if light could have been to go straight, but a strong gravitational pull it deviated from the original direction. .</ P>.