Black hole is a region in space from which nothing can escape, not even light. The gravitational force of this area is so strong that it attracts everything in its magnetic field. Many people are confused about the origin of black holes. I know that even you must be crazy to know that how does a black hole form. A black hole forms when any object reaches a certain critical density, and its gravity causes it to collapse to an almost infinitely small pin point. Black hole is a result of deformation of space-time caused by a very compact mass. Here, space-time is a mathematical model which is a single continuum.

Do you know that why does a black hole called ‘black’. This region in space absorbs everything, even the light rays without reflecting anything. Hence it causes a dark area where you can’t see anything. However in the latest researches it is found that some black holes emit the heat radiation, but the reason has been not confirmed yet. Also, it is said by many scientists that black holes are the dead stars.

Space telescopes are not able to see the interior structure of  a black hole. Even satellites are unable to give us the picture of inside black hole. But scientists claim its existence by observing the movements of black holes amongst other celestial bodies. They detect these black holes by tracking the movement of surrounding stars. They have understood it more deeply, by observing the gas that entered the black hole area in spiral way due to the gravitational force. They also found that the gas was heated up to very high temperature that causes a large amount of radiation. These radiation were picked up by the astronomers through the telescopes and satellites.

Black holes are the mysteries that will take many years to expose the space related reality, however some scientists still deny the existence of black holes.

The national space policy that President Barack Obama recently enacted actually advises NASA to utilize commercial services by delivering both crew and cargo to what is known as low-Earth orbit. This market will be not only for science and exploration, but will also be used for things like suborbital flights and even space tourism. With the space shuttle program coming to an end by the close of 2011, NASA experts all agree that the only way that the programs will be able to continue to provide information about the world around us is going to be to open up low-Earth orbit, making it available to commercial launch providers.

So what does this mean for the average Joe? It depends on how successful NASA’s attempt to bring commercial launch into the picture is. If they do manage to find the balance between commercial launches and exploration, we will still be able to learn more about the solar system and what lies beyond. Being unable to find that balance, however, means that it’s very likely that space exploration will slow and may, if things do not change as time passes, end completely. One thing’s for sure: we’re headed into a brave and bold new world when it comes to space exploration. One where commercial needs are just as important as scientific requirements, and it’s definitely going to be a ride that will be interesting to watch.

Would you be surprised to know that they zoom past our planet on a fairly regular basis? The rock that went by the Earth on Wednesday was around 9 ½ feet across, making it about the size of a car. This may seem like a huge rock to us, but in reality it’s actually extremely tiny when you compare it to everything that goes on in space. Think about how large our planet is. It takes a great amount of power and technology for scientists to see other planets that are as large as ours. When you think about how small 9 ½ feet is in comparison to our own planet, it’s easy to see why scientists miss most of the asteroids that fly past us.

You also need to take into account how close they come to our planet. When you hear scientists say “an asteroid that is as large as a car will pass close by the Earth”, your definition of close will likely be very different from theirs. To most people, close is having only a few inches between you and another parked car. In this case close means that it flew within 64,000 miles of the Earth. When you read that number, 64,000, it seems like the asteroid didn’t fly anywhere near close.

In never-ending world of space, however, 64,000 miles is definitely close. There have been other asteroids that have come closer, including one on February 4th of 2011 that passed within 3,400 miles of the earth. Again, that many miles seems like it would be far away. Our own moon, however, the closest orbiting object to the Earth, is about 238,900 miles away. When you factor that into the equation, you can see why scientists say that 64,000 miles is close. Who knows how many times asteroids fly by our planet?
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