LiVe YoUr DrEaM…

We all are Atoms.

Posted on: January 18, 2010

The book begins with the public speech by scientist, who explains the audience
“how the earth orbits around the sun and how the sun, in turn, orbits around the center of a vast collection of stars called our galaxy”.
at the end of lecturer little old lady says : “What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise.” Then scientist reply’s : “What is the tortoise standing on.”,
the lady : “You’re very clever, young man, very clever, But it’s turtles all the way down!”.

This is the well know and popular science book A Brief History Of Time : by Stephen hawking.

The Brief History Of Time

In this book Stephen hawking explains the range of topic including “Cosmology”, “Big Bang” and “Black Holes, also Stephen tried to answer the following question in this book :

1. Where did the universe come from, and where is it going?
2. Did the universe have a beginning, and if so, what happened before then?
3. What is the nature of time? Will it ever come to an end? Can we go back in time?

Starting from 340 B.C Greek philosopher Aristotle’s , Stephen explains how the picture of our universe changed time to time.

The most of the theory or concepts explained in this are not totally alien, you might have learned if you are a science student or you might have heard these theories.

Then he explains the Big Bang, early discoveries that shows that the all the galaxies are moving apart from us, this means that they were at some time must be at very tiny place, then came the big bang (BOOOOM) . After Big Bang galaxies started to move away from each other, it is believed that, the universe will come to an end at the Big Crunch, this will happen only if the galaxies starts to contract.

So at the time of big bang, time started, because time started at big bang, it will come to an end at big crunch.

If the Universe is expanding , then in the past, it must have been considerably smaller. Say about 15 or 20 billions years ago all the matter have been concentrated in a tiny place.

A great discovery of the twentieth century is that all matter is made up of only a few microscopic molecules.

Then Stephen put the question : what are the truly elementary particles, the basic building blocks from which everything is made?

So the basic building blocks are quarks. So three quarks when combines result in a proton or neutron. So we know that proton and neutrons are joined to form nucleus. Nucleus is the central part of the Atom. Atoms join together to create molecules, so every microscopic particle in the universe is made up of molecules. So human flush, rocks and trees everything is made up of molecules.

According to science, everything is made up Atoms, Atoms joins together to create molecules, which intern created everything. If so our mind is also created using the same procedure, If so, why we got the power of thinking, while other creatures who created using the same molecules didn’t got the power of thinking ?
Why only humans are intelligent species ?

Then Hawking explains about the black holes, Black Holes are coined by John Wheeler in 1969.
Black Hole is considered to be a region in the space from which nothing can escape, not even light.

These regions are called black holes because it absorb the light coming toward it, and emit nothing resulting a black body.
Black holes are created when the star run out of fuel, and start to shrink in it’s gravitational field.

What if we reverse the process of black hole creation, this means that every particle in the black seems like expanding,
this means that in the past, this may be possible that the universe is created out of black hole. If this is true, then after some more billions years will end at Big Crunch.

If the universe is expanding at very slow rate then it will start to contract after some distance.
for Example, when we throw a stone at sky, after some distant it will come back, due to gravitational pull. If we throw same stone at the speed of 7 Miles/Second, then it can go beyond our gravitational pull, start to float in the universe.
So If the universe is expanding at the rate which can bypass the gravitational pull, then it will expand forever, if it is expanding at some constant rate which cannot bypass the gravity, then it will start to contract after certain distance.

What happens when universe start to contract, will time run backward ?

The book ends with three short chapters about the great physicists Galileo, Newton and Einstein.

Overall this is a good book, In which the concepts of physics, cosmology, big band, black holes and big crunch are explained very well without using any complex formulas expect E = mc2.

I give it : 4/5.

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