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Black Holes


I recently watched the "Chrsitopher nolan" movie INTERSTELLAR and there were somethings about black hole that i quiet didn't understood.Then i came to know many other people were having this problem,so this post is to you guys
  • Astronomers have spent much time analysing how stars form and how they develop.One problem was to explain what happened to a massive star at the end of its life.
  • In 1967 the term "black hole" was used to describe one type of object that is left when a massive star dies.
  • Four years later,Cygnus X-1 was found,the first candidate for a black hole

 1.DETECTING A BLACK HOLE 

  • Black holes appear black because nothing,not even light, can escape from their gravity.
  • Astronomers cannot detect them directly, but can "see" them because of the effect their gravity has on everything around them,such as gas from a nearby star.
  • The boundary of the black hole is called event horizon.

2.ENTERING A BLACK HOLE
  1.   At the start of the fall, everything appears normal.
  2. As the astronaut approaches the hole, he starts to be stretched.
  3. Light is also stretched to a longer wavelength so the astronaut appears redder
  4. Gravity stretches the astronaut.Close to the hole, he is torn apart


3.INSIDE A BLACK HOLE


  • Space and time a highly distorted inside a black hole.
  • Anyone unlucky enough to fall into one would be stretched to resemble spaghetti, as gravity pulled more on the feet than the head.
  • An observer watching the person fall would also see time running slower as the person fell towards the event horizon 

Roger Penrose 

  • The English mathematician Roger Penrose (b.1931) theorizes on the nature of space and time
  • He has shown that a massive collapsing star inevitably becomes a black hole, and that all black holes have a singularity point, occupying no virtually no space,that contains the entire mass of the dead star
  • Penrose believes the singularity is always hidden by an event horizon 


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