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About Black Holes:-
Black holes are very mysterious thing which is found in space. Black hole is such a thing which attracts every thing towards it's self and after taht nobody knows that where is the thing which is attracted by black hole. According to Scientists black hole is a thing have a very high capacity of attraction.








Discovery:-
In 1916, the German astronomer Schwarzschild, with the support of Einstein's works, calculated the size of a star whose escape velocity would be equal to the speed of light .
This speed is an absolute limit, and according to relativity, nothing can go faster.

Theories about black holes:-
What's more, we know that the size of a neutron star decreases when its mass increases, because gravity becomes stronger than the degeneracy pressure.
If the mass of such a star increases, there comes a time, called the Oppenheimer-Volkoff limit, when the escape velocity becomes equal to the speed of light, and nothing will be able to escape the star.
Let us notice that the cohesion of a neutron star is also depending of the strong nuclear interaction. As the behaviour of this interaction is poorly understood under a high gravity, the Oppenheimer-Volkoff limit is not precisely known. It is contained between 1.5 and 3 solar masses.

If nothing, not even light, can't escape, this star becomes invisible : Such an object is called a black hole.
The black hole has no material surface ; the original matter of the star is shrunk to an infinitely dense point, called a singularity.
The "surface" of the black hole is called the horizon, its size is called 'Schwarzschild radius'.

If G is the gravitational constant and M the mass of a body whose radius is R, the escape velocity is .
In the case of a black hole, this velocity is equal to c the speed of light,
hence the Schwarzschild radius of a black hole is expressed as
You can watch more about Black Holes in the following videos:-

Some lines of this article is copied by:-http://nrumiano.free.fr/Estars/b_holes.html

On 10:47 | 0 comments

Lake of Saif-ul-malook is a very heart touching and beautiful natural place in Pakistan.
Location:-
      It is situated in the Northern end of vally of Kaghan near Naran. It is the Northern East of Mahnsera District in the Khyber-Pakhtunkhwa province, Pakistan. At an altitude of 3,224 m (10,578 feet) above sea level it is amongst one of the highest lakes in Pakistan.

History:-
The weather here is moderate during day time while the temperature drops to minus degrees at night.
A fairy tale called Saiful Muluk, written by the famous Sufi poet Mian Muhammad Bakhsh, is associated with the lake. It is the story of the prince of Persia who fell in love with a fairy princess at the lake^. The impact of the lake beauty is of such extent that people believe that fairies come down to lake in full moon. A poet and writer from Balakot Dr Mujahid hussain wrote the story of Saiful Muluk in prose depicting the local version.

 

 Here are some views of lake Saif-ul-malook in night time:-

 

This is a view of jheel Saif-ul-malook taken from upper side:-

Here is video of this lake:-

On 10:08 | 1 comments

Some lines of this articles is copied by: http://en.wikipedia.org/wiki/Bermuda_Triangle
Introduction:-

The Mystery of Barmuda Triangle is very quires, many scientists have already failed to describe about it. Another name which is used for it is "Devil's Triangle". It is a region in the western part of the North Atlantic Ocean where a number of aircraft and surface vessels are said to have disappeared under mysterious circumstances.
Popular culture has attributed these disappearances to the paranormal or activity by extraterrestrial beings.

 

 Documented evidence indicates that a significant percentage of the incidents were spurious, inaccurately reported or embellished by later authors, and numerous official agencies have stated that the number and nature of disappearances in the region is similar to that in any other area of ocean.

  





                                                  
    





          UFO in barmuda triangle:-
According to the mystery some times UFO(Unidentified Flying Object) is also seen in the triagle.In a span of less than two years, two of the most perplexing aircraft disappearances occurred. Each was a world away from the other. One off Australia; the other off Puerto Rico in the Bermuda Triangle. Yet both were strikingly similar. Both pilots were sober individuals, one was a US Marine. Both reported a strange object harassing or, at the very least, highly interested in their aircraft. Both could not describe exactly what it was. But in both cases, when it came in closer, it apparently caused a disruption of radio communication and cut out electro-magnetic power, causing the engine to sputter. Neither aircraft left any trace. Both carried ELTs, automatic alarms that are jettisoned when the aircraft impacts. This triggers them to send their electronic SOS signals, guiding rescuers to the point of the incident. Yet in both these incidents they were hushed,  for no signal was ever picked up.
   The cases which will be placed in this section of the Web Site are not intended to explain the UFO phenomenon, only to document that it does indeed exist; and, most relevant to the subject at hand, that it is often associated with missing aircraft. Theories concerning how they may be associated with the Bermuda Triangle are dealt with in the Theories Section.

Here is the video about the mysteries of barmuda triangle:-

On 02:00 | 0 comments