Death of the universe?(1)

Death of the universe?(1)
Will our universe come to an end? Will it rip to shreds in a flash? Collapse on it self? Or will it slowly freeze to death?
Scientists are imaging the unimaginable and they're coming up with some wild ideas about how it's all going to end. This is the end of the universe. A battle is taking place in the farthest reaches of space. No one can see it, but scientists are certain that it's happening and that the outcome is grim. The universe is going to the end. It won't happen for billions of years  but there is no way out. Working out how it will end is the challenge of astrophysicists around the world. They're pointing high-tech equipment out toward the heavens to unlock the secrets of our fate.

The possibilities are frightening. In one scenario ...gravity pulls the universe back into itself similar to air being let out of an inflated balloon. The universe goes back to its original size. This is the big Crunch. It'd be the end universe in a big fireball as all the matter collapses on to itself. That'd be pretty dramatic. Then there's the big Chill.The universe expands until the nuclear furnaces that power all the stars burn out. The universe grows cold and dies. A second possibility is actually kind of sad.The universe will continue to expand forever and it will just grow into an increasingly cold and lonely place as the expansion removes our nearest neighbors from us and we just end up a single isolated community... of stars and galaxies.

Then again, there could be a much more spectacular end in which every thing is ripped to shreds, down to the last atom. Think of it like balloon that is filled with too much air.It pops.It's much more dramatic than the big Chill and just as fateful as the Big Crunch. The universe continues to expand, but at an ever-quickening pace. And in fact, the pace is so great that even the space-time... fabric cannot hold the universe together.

However the end comes, it will be a dramatic conclusion.To understand how it all could end,scientists turn to how it began.The mystery starts to be solve here at the Mount Wilson Observatory overlooking Pasadena, California.In 1929, while looking through what was then the world's largest telescope, Edwin Hubble makes a strange discover. The universe is expanding. Hubble's discovery led to a whole new picture of the universe. That it was a dynamic environment and that it evolved. It change in time. And that's different from pictures that people had of cosmology previous to that. Before Hubble, scientists said that the universe was static and unchanging.

Hubble's discovery that the universe is expanding meant it had starting point. A begining.That brought the idea forward that hey, what if we ran the film backwards in time and found the point at which that began? And that was where the idea of a Big Bang came from.

The Big Bang. That fraction of a second when the universe and everything in it exploded into existence from a point smaller than an atom. One common misconception about the Big Bang is that we can identify a point in space where the Big Bang occured.But in fact, it's more appropriate to think of the Big Bang as a simultaneous creation everywhere of space, which is then continuing to expand until the present day.

If the universe has been expanding since the Big Bang, scientists must consider that it will stop expanding at some point. The question is: how? The most obvious answer involves gravity what goes up, must come down. Star and galaxies and everything else might reverse direction. The universe would collapse in what some scientists call a Big Crunch.

Take the top and then see the other handle? And just jerk them apart. A model rocket offers clues to how the Big Crunch would work. The rocket is like the universe expanding into space out of the Big Bang. An initial bang allows the rocket to overcome the pull of gravity. The engine blast gets the rocket moving off its launch pad. It accelerates into the air and breaks free of gravity's pull, for the moment. It appears as it's climbing upward that it will never stop. But Earth's gravity won't allow this to go on forever. Eventually, when the fuel is exhausted, the rocket coasts about a meter higher, stops, and is pulled back to Earth.

This is what would happen with a Big Crunch. The entire universe is essentially pulled back to its launch pad. The universe itself has its own momentum, its own energy. It's moving outward. But eventually there's a point where possibly the universe will stop that moving outward just like the rocket that we saw and have to fall back in upon itself and collapse again under the force of its own gravity.

Death of the universe?(2)
Death of the universe?(3)
Death of the universe?(4)
Death of the universe?(5)
Death of the universe?(6)
Death of the universe?(7 end)
 

1 comment: