Is the big bang theory true-?

Answer 1

It probably is! And here we are.

Really, we can't know for sure. It is a theory, meaning that it is a idea. (Sorry,an idea is just an idea; a hypothesis is an idea which can be tested; a theory is an idea which has been tested and (so far) has been confirmed to (probably) be correct.

[If a person chooses to believe in the Big Bang Theory, then that is a matter of opinion.] There is no way to know... for sure ... about anything.

Fortunately, the Big Bang CAN be tested. If the matter in our Universe has been expanding at a (fairly) constant rate since about 13.7 billion years ago, then we would observe the following:

1) Distant galaxies would all be seen as moving away from us, and the rate at which they are receding would be proportional to the distance from us.

2) The calculation of when all galaxies began this expansion -- but working backward to when matter would be lumped together -- would be about 13.7 billion years.

3) Microwave radiation with a black-body spectrum of about 3.7 degrees Kelvin would be seem coming towards our Earth in a perfect isotropic manner.

4) Old galaxies would not be seen at distances greater than a few billion light-years distance.

4) White dwarfs, whose life-span is about 100 trillion years, would not be observed older than 13 billion years.

5) The ratio of hydrogen to helium in all parts of our Universe would be about four to one.

6) Ratios of hydrogen to deuterium would also be within a specific range.

7) Ratios of certain isotopes, whose half-life is in billions of years, would be in a narrow, specific range to their decay products.

ALL of the above HAVE been observed. Proponents of all other hypotheses about our Universe are reduced to saying, "These are things we just observe, but I have no explanation for them."

If Newton was correct that gravity acts like a force that depends on the mass of two objects and the inverse square of the distance between them, then we would observe planets moving about our Sun in eliptical orbits -- which we do. Perturbations of these orbits would need to be explained by other planets moving around our Sun -- and predictions of the size and locations of such planets, based on Newton's ideas, match PERFECTLY with the planets seen by astronomers.

We can either conclude that Newton was correct, OR we can shrug our shoulders and say "If a person chooses to believe in the Newton's Gravity Theory, then that is a matter of opinion. There is no way to know... for sure ... about anything." I think that the former approach is a far more intelligent one.

And I'll say the same thing about the Big Bang.

Answer 2

It is a theory that hasn't been proven or dis proven, but most physicists believe it is the way the universe was created. Many will not consider it as viable at all based on religious beliefs.

Answer 3

The Big Bang Theory isn't finished and little details are always changing. Many Scientists believe the basic concept of the Big Bang is true.