What is the primary evidence of the Big Bang Theory?

Answer 1

Answer 1

we are the evidence of the big bang and everything you see.

The evidence that the space that constites our Universe has been expanding since about 13.7 billion years ago is overwhelming.

1) all galaxies outside our Local Group are red-shifted, meaning the distance between these galaxies and us is increasing.The size of this red shift is directly proportional to the distance between us and those galaxies. The time when all of the visible (to us, anyway) matter was compacted as far as we can understand, is called the Big Bang. Calculation of the Hubble Constant gives that time at about 13 billion years ago. Interestingly, this time agrees with the ratio of slow-decaying elements AND the age of the oldest known stars.

2) this hypothesis predicted, in 1946, the existence of an isotropic and uniform microwave radiation whose spectrum would match that of a black-body at 3.7 K. The cosmic microwave background radiation was found eighteen years later and corresponds perfectly with the prediction.

3) the hypothesis predicts that all parts of our Universe would constitute 90% hydrogen and 10% helium -- exactly as seen.

No other hypotheses can explain (2) or (3) better than saying, "That's just the way our Universe is -- we can't explain why."

4) Long-evolved galaxies are seen close to us, but none are seen far from us. This is impossible to explain EXCEPT with the simple idea that, at a far distance from us, we can ONLY see galaxies that have not had time to evolve for a long time.

- Hubble's law.

- Distribution of elements.

- Isotropy of CMB.

- Distribution and size of variances in the CMB.

Answer 2

Edit : Hubble's Law, that's the rate of expansion of the Universe, of course.

The proportion of the original elements hydrogen, helium and lithium is the important thing, as regards the elements.

Note: More specifically, Hubble's Law is the correlation between the apparent distance of remote galaxies and their redshift.

CMB is the Cosmic Microwave Background radiation, of course. Just the

existence of this radiation is strong evidence of a "Big Bang". Detailed analysis

of the CMB is important too, as mentioned above.

I would add one more thing : The study of the galaxies, their distribution, and

evolution, gives more support to the theory.

Answer 2

The evidence which pretty much established the theory for most astronomers was the discovery of the 3K cosmic background radiation (CBR) aka the Microwave Background Radiation (MBR).

There are many other observations that support the big bang theory, but this is the primary one.

Answer 3

the galaxies are moving away from each other, and the red shift is directly proportional to the distance between them.

The spectrum and the isotropic nature of the Cosmic Microwave Background Radiation is perfectly predicted by the Big Bang.

The respective percentages of hydrogen, helium, and lithium in our Universe are as predicted by the Big Bang.

Alternate hypotheses can only say, "We don't know why these irrefutable facts are true. They just are."

Science generally prefer hypotheses that can explain the observed facts of our Universe over those that say, "That's just the way things are."

Answer 4

First, all the objects in the universe are moving away from each other at a very fast pace; suggesting, that they were all, at one point, very, very, very close together. And second, antimatter.

Answer 5

They didn't "use" their discovery to support anything, or, for that matter, to

explain anything. They simply discovered it.

If I'm not mistaken, that discovery was published before the Big Bang theory was

ever proposed. When it WAS finally proposed, one of the arguments in its favor

was the fact that the theory could explain the cosmic microwave background.

This was such a relief that Penzias was able to relax and stop worrying and go

to work as the Director of Bell Labs. I don't know what Wilson went on to do,

but I'm sure it was something equally impressive.

Answer 6

The basic logic goes like this:

Nearly all galaxies have an observed redshift, which is interpreted to mean they are receding from us.

The redshift is greater for more distant galaxies, indicating they are moving away from us faster than closer galaxies.

This is deemed to be evidence of a big bang, because if everything gets further apart as time goes on, then going back means they were closer together. Go back far enough, and then everything must have been right next to eachother, in a hot compact mass.

This means a long time ago the entire universe must have been an intensely hot mass of energy.

Now, the universe has expanded, and cooled, but light takes time to travel. Some of that light from the explosion is still traveling, having been delayed in its journey by the expansion of the universe.

Theorists predicted that this light would have been stretched out from super short wavelength, high energy gamma rays, down to much longer microwavelight by now.

The first microwave telescope found this light when it looked at the night sky, in a very good match with theory. And not only did it find this light, but it is EVERYWHERE, from all directions, with no strong sources. meaning we can't say that a star or galaxy, or even a type of object is making it. It had to have been created by an event that happened everywhere in the universe, and a long time ago...both of which point very strongly to the BB theory being accurate.

Answer 7

Well, the big bang theory includes the existence of you, me, and of everything in this world. Simply evidence of big bang means the existence of everything

Answer 8

They heard a loud noise.