Saturday, October 16, 2010

:::::::BLACK HOLE::::::::::

star is a huge, amazing fusion reactor. Because stars are so massive and made out of gas, there is an intense gravitational field that is always trying to collapse the star. The fusion reactions happening in the core are like a giant fusion bomb that is trying to explode the star. The balance between the gravitational forces and the explosive forces is what defines the size of the star.
As the star dies, the nuclear fusion reactions stop because the fuel for these reactions gets burned up. At the same time, the star's gravity pulls material inward and compresses the core. As the core compresses, it heats up and eventually creates a supernova explosion in which the material and radiation blasts out into space. What remains is the highly compressed, and extremely massive,
core. The core's gravity is so strong that even
light cannot escape.


Artist concept of a black hole: The arrows show the paths of objects in and around the opening of the black hole.Photo courtesy NASA
Artist concept of a black hole: The arrows show the paths of objects in and around the opening of the black hole.




This object is now a black hole and literally disappears from view. Because the core's gravity is so strong, the core sinks through the fabric of space-time, creating a hole in space-time -- this is why the object is called a black hole.
The core becomes the central part of the black hole called the singularity. The opening of the hole is called the event horizon.
You can think of the event horizon as the mouth of the black hole. Once something passes the event horizon, it is gone for good. Once inside the event horizon, all "events" (points in space-time) stop, and nothing (even light) can escape. The radius of the event horizon is called the Schwarzschild radius, named after astronomer Karl Schwarzschild, whose work led to the theory of black holes. 








 Supermassive black holes in some giant galaxies create such a hostile environment, they shut down the formation of new stars. Strangely, black holes lie at the center of most galaxies, as shown in the next image.
 Dark matter composition is up for debate, with subatomic particles and black holes considered as candidates.
 This is a new composite image of a galaxy cluster located about 2.6 billion light-years away. The three views of the region were taken with NASA's Hubble Space Telescope in February 2006. See a massive radio telescope in the next photo.
 Like most galaxies, NGC 1097, a barred spiral galaxy, has a supermassive black hole at its center.
 In this artist's rendition, the yellow region at the center represents a supermassive black hole. Around are dust grains mixed with heated, outflowing gas. But just how big is "supermassive?" Find out in the next photo!
This is a depiction of a wormhole, or an Einstein-Rosen bridge, bursting open in the vacuum of space. Many believe these curves in spacetime could enable time travel. 

......I really need your time.....!!!!!!!!

A man came home from work late, tired and irritated, to find his 5-year old son waiting for him at the door.

SON: "Daddy, may I ask you a question?"
DAD: "Yeah sure, what is it?" replied the man.

SON: "Daddy, how much do you make an hour?"
DAD: "That's none of your business. Why do you ask such a thing?" the man said angrily.

SON: "I just want to know. Please tell me, how much do you make an hour?"
DAD: "If you must know, I make Rs.100 an hour."

"Oh," the little boy replied, with his head down.Looking up, he said, "Daddy, may I please borrow Rs.50?"


The father was furious, "If the only reason you asked that is so you can borrow some money to buy a silly toy or some other nonsense, then you march yourself straight to your room and go to bed. Think about why you are being so selfish. I work hard everyday for such this childish behavior."


The little boy quietly went to his room and shut the door. The man sat down and started to get even angrier about the little boy's questions. How dare he ask such questions only to get some money?

After about an hour or so, the man had calmed down, and started to think: Maybe there was something he really needed to buy with that Rs.50 and he really didn't ask for money very often. The man went to the door of the little boy's room and opened the door.

"Are you asleep, son?" He asked.

No daddy, I'm awake," replied the boy.

"I've been thinking, maybe I was too hard on you earlier," said the man.

"It's been a long day and I took out my aggravation on you. Here's the Rs.50 you asked for." The little boy sat straight up, smiling. "Oh, thank you daddy!" He yelled.

Then, reaching under his pillow he pulled out some crumpled up bills. The man, seeing that the boy already had money, started to get angry again. The little boy slowly counted out his money, and then looked up at his father.

"Why do you want more money if you already have some?" the father grumbled.

"Because I didn't have enough, but now I do," the little boy replied.

"Daddy, I have Rs.100 now. Can I buy an hour of your time? Please come home early tomorrow. I would like to have dinner with you."

Share this story with someone you like....

But even better, share Rs.100 worth of time with someone you love. It's just a short reminder to all of you working so hard in life. We should not let time slip through our fingers without having spent some time with those who really matter to us, those close ! To our hearts.