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

At the start of the fall, everything appears normal.
As the astronaut approaches the hole, he starts to be stretched.
Light is also stretched to a longer wavelength so the astronaut appears redder
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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