Some interesting facts about black holes

Black holes are one of the most fascinating objects in the universe.  The black holes have three "layers" - the outer and inner event horizon and the singularity.  The event horizon is the boundary around the mouth of the black hole where the light loses its ability to escape.  Once any particle crosses the event horizon, it can not escape.  The gravity is constant across event horizon.  The inner region of a black hole is the place where its mass lies and is known as Singularity.  This is a single place in space where the mass of the black hole is concentrated.  Here are some of the interesting facts about the black holes.

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• If you fall into a black hole, the strong gravity would stretch you like a spaghetti.  You will die before you reach singularity.
• Black holes do not such.  Suction is caused by pulling something into vacuum.  But objects simply fall into a black hole.
• The first object to be considered as a black hole is Cygnus X-1.  Rockets carrying Geiger counters discovered 8 new x-ray sources.  In the year 1971, scientists detected radio emissions coming from Cygnus X-1 and it was identified as a black hole
•  If a star passes too close to a black hole, it can be torn apart
• Astronomers estimate that there may be 10 million to a billion stellar black holes with masses equal to 3 times of our Sun in the Milky Way Galaxy.
• The life cycle of most of the stars end up being a white dwarf or a neutron star.  but the black holes are the last evolutionary stage in the life time of a star
• There are 3 types of black holes - Stellar, Super massive and Intermediate black holes depending on their mass
•  As the black holes have strong gravity which pulls all of the light into its center, black holes can not be seen.
• The black holes too follow the laws of gravitation.  So in order to affect our Earth, the orbit of a  black hole has to be very near to solar system which is not likely,.
• Astronomers believe that our own Milky way galaxy has a super massive black hole at the center.
• One interesting fact is that black holes can not such all the matter in the universe.  Each black hole has its own event horizon similar to the gravitational field of a planet.  If the matter is not in the horizon, it will never get sucked into the black hole.
•  The giant black  hole at the center of Milky Way galaxy weighs about 4 million Suns.  But fortunately it is 30,000 light years away from us
• There is a belief that black hole eventually evaporate.  Black holes emit radiation.  The energy that produces radiation comes from the mass of the black hole. As the radiation is emitted, a black holes loses its mass.  So the black holes becomes smaller as it emits radiation. In effect, a black hole evaporates more quickly as it shrinks.