Archive for the ‘General’ Category

Q.4 Do Our Solar System Got Birth with An Explosion Called ” THE BIG BANG” ???

June 27, 2010 1 comment

In this section of my blog I want to take scientific mysteries that are solved or unsolved. Have a look at them and let me know your thoughts.

In this post I have started with the Big bang Theory. Before doing our discussion let see what is this theory.

Big Bang Theory, currently accepted explanation of the beginning of the universe. The big bang theory proposes that the universe was once extremely compact, dense, and hot. Some original event, a cosmic explosion called the big bang, occurred about 10 billion to 20 billion years ago, and the universe has since been expanding and cooling.

The theory is based on the mathematical equations, known as the field equations, of the general theory of relativity set forth in 1915 by Albert Einstein.
In 1922 Russian physicist Alexander Friedmann provided a set of solutions to the field equations. These solutions have served as the framework for much of the current theoretical work on the big bang theory. American astronomer Edwin Hubble provided some of the greatest supporting evidence for the theory with his 1929 discovery that the light of distant galaxies was universally shifted toward the red end of the spectrum. This proved that the galaxies were moving away from each other. He found that galaxies farther away were moving away faster, showing that the universe is expanding uniformly. However, the universe’s initial state was still unknown.

In the 1940s Russian American physicist George Gamow worked out a theory that fit with Friedmann’s solutions in which the universe expanded from a hot, dense state. In 1950 British astronomer Fred Hoyle, in support of his own opposing steady-state theory, referred to Gamow’s theory as a mere “big bang,” but the name stuck. Indeed, a contest in the 1990s by Sky & Telescope magazine to find a better (perhaps more dignified) name did not produce one.

Above was some introduction to The Big Bang Theory but the question is that Is theory accepted all over? NO.. Lets see what the critics says about it.

In his book, A brief history of Time, the well-known British physicist, Stephen W. Hawking, identifies the ultimate question behind everything. ‘Today we still yearn to know why we are here and where we came from.’

In the last chapter of his book he says:

‘We find ourselves in a bewildering world. We want to make sense of what we see around us and to ask: What is the nature of the universe? What is our place in it and where did it and we come from? Why is it the way it is?’

Hawking concedes that the important question of why the universe exists cannot be answered by means of equations and theories.

‘Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe?’

Nevertheless, he concludes his book by limiting himself to the equations, instead of looking for their Author.

‘However, if we do discover a complete theory, it should in time be understandable … by everyone, not just a few scientists. Then we shall all … be able to take part in the discussion of the question of why it is that we and the universe exist. If we find the answer to that, it would be the ultimate triumph of human reason—for then we would know the mind of God.’

Like so many other astronomers and physicists, Hawking tries to explain the universe without acknowledging its Creator. But Isaac Newton (1642–1727), possibly the greatest physicist of all time, and a predecessor of Hawking in the same chair at Cambridge University, firmly believed that the solar system was created by God.

The idea that the solar system emerged from a swirl of matter began with Immanuel Kant (1724–1804). Many present-day cosmologists describe the cosmos in terms of evolutionary development and most of them accept the so-called big bang theory.

According to this theory, the universe began about 10 to 20 thousand million [10–20 billion—Ed.] years ago as an inconceivably small volume of space (or a single point of vast energy) which has been expanding ever since. The most important observation supporting the concept of an expanding universe is the ‘red shift’ of light from distant stars.

This inferred expansion cannot be observed directly, but light coming from distant galaxies seems to have longer wavelengths (i.e. gets ‘redder’) as the distance increases. This is attributed to either the Doppler effect (that the wavelengths of light are ‘stretched out’ when galaxies move away from one another) or the relativistic stretching of the space between the stars as the universe expands. The big bang theory suggests that the cosmos was originally compressed into a hot and dense ‘cosmic egg,’ and as the universe aged, it expanded.

Space does not permit a full discussion of the evidence for and against the big bang. However, many discoveries made in recent years with improved instruments and improved observational methods have repeatedly shaken this theory.5 Interpretations of the available facts in terms of currently held cosmological models very quickly lead to unresolvable inconsistencies. There is an increasing number of astronomers who raise substantial arguments against the theory.

If the universe came from a big bang, then matter should be evenly distributed. However, the universe contains an extremely uneven distribution of mass. This means that matter is concentrated into zones and planes around relatively empty regions. Two astronomers, Geller and Huchra, embarked on a measuring program expecting to find evidence to support the big bang model. By compiling large star maps, they hoped to demonstrate that matter is uniformly distributed throughout the cosmos (when a large enough scale is considered).

The more progress they made with their cartographic overview of space, the clearer it became that distant galaxies are clustered like cosmic continents beyond nearly empty reaches of space. The big bang model was strongly shaken by this discovery.

It should be added that the visible galaxies do not contain enough mass to explain the existence and distribution of these structures. But the big bang model was not discarded. Instead, the existence of a mysterious, unknown, and unseen form of matter (‘dark matter’) was postulated. Without any direct evidence for its existence, this ‘dark matter’ is supposed to be 10 times the amount of visibly observed mass.

Categories: General

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