anonymous
  • anonymous
if nothing can escape a black hole how do we know that they exist?
Physics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
there are probably lots of ways...the immense gravity of black holes suck matter out of the stars close to them...the effect of black holes on nearby objetcs could very well reveal their presence
anonymous
  • anonymous
if the nearby objects are effected by the black hole , then they are taken into it then how do we know it even existed
anonymous
  • anonymous
hey,whole stars wont be sucked in instantly...further the gravitaional inflence of black holes on the postiion and behaviour of close by stellar objects will show

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anonymous
  • anonymous
im just saying its not a very impossible task
anonymous
  • anonymous
ok all clear now
anonymous
  • anonymous
graphical illustration of blackhole sucking a star
anonymous
  • anonymous
Even a black hole radiates too; called Hawking's radiation, that can be explained by quantum fluctuation of space-time as particle anti-particle pair. Decay of a black hole can be explained by this phenomenon. It's explained in the Stephen Hawking's "A Brief History of Time". {however not the answer of your question, just related to the subject and its interesting}
anonymous
  • anonymous
actually this question is in resenick halliday gravitation chapter
anonymous
  • anonymous
Even though black holes are invisible, they act a bit like a lens when they are in front of something bright. I have a hunch that this 'gravitational lensing' phenomenon is used to identify them.
anonymous
  • anonymous
these black holes are what stars become when they die often after a supernova....these black holes suck everything on their path ..... we know this because our powerful satellites and telescopes have capability to view objects and and matter which are light years away from us.
anonymous
  • anonymous
and gokuldas_tvm they do not act like lens when something bright is in front of them..... we noe there is black whole when there are sudden changes in space and if high radiation is observed as black tend to emit radiation.
anonymous
  • anonymous
Einstein's solar eclipse experiment proved light is bent in a gravity field just like a black hole would noticeably do.
anonymous
  • anonymous
@siddharth: There is a phenomenon called gravitational lensing. This was demonstrated by Einstein himself. A very strong gravity field can bend the path of light - as a lens would do. Black holes do exhibit this behaviour.
anonymous
  • anonymous
@gokul thnx for that information i knew that there is a phenomenon called gravitational lensing but was surprised to noe black wholes exhibit this king of behavior. and again thnx for the info....btw do worm wholes also exhibit the same behaviour
anonymous
  • anonymous
@siddharth: Anything that distorts space-time must be able to do that. So may be, worm holes too.
anonymous
  • anonymous
hey gokul ...according to gravitational lensing and Einstein's general relativity ,light can bend in space ......if so, it defeats the purpose of satellites ....satellites are place around the earth to send messages or anything for that matter around the world....satellites are placed around the whole earth because the curvature of the earth prevents direct contact of rays from point A to point B ......why cant they create a distortion in space and make the rays or light bend?
anonymous
  • anonymous
I am wondering what kind of gravity would be required to bend the radio beam around the globe. Hey, that reminded of something. Around black holes, there is a boundary called 'event horizon'. Nothing that enters the event horizon can escape. Event horizon is actually defined as the place above a black hole where the orbital speed becomes equal to light speed. So if you have a light beam at event horizon, it will orbit the black hole (I think!!). Imagine doing the same around Earth!
anonymous
  • anonymous
ya the event horizon is also described as the point of no return any mater which enters event horizon gets shredded into pieces ...the smaller pieces revolve or stray around the black whole and the bigger pieces which cannot be shredded any finer gets sucked away into the black hole
anonymous
  • anonymous
i think the existence is hypothetical......... it is needed to explain the mass what we calculate for universe.......not only that something with mass has to be formed after a supernova explosion.
anonymous
  • anonymous
how can u say a black hole is hypothetical it is what happens to a star after it dies.... also known as supernova.....
anonymous
  • anonymous
@jithu: I remember seeing a TV show about blackholes. In that show, it showed the results of a research team. A star near the Milky way's centre suddenly changed its trajectory. The only way to explain this event was with a black hole. Black holes are more than just hypothetical - there is no more any doubt or surprise in their existence.

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