# Can someone explain the Big Bang theory?

I need a good explanation.

Relevance
• 9 years ago

Okay, I'll tell you what I've learned over the years...

Before the big bang, scientists believe there were equal amounts of matter and antimatter. When these collided, it resulted in the great explosion we call the big bang. The debris from the explosion spread throughout the universe, eventually forming into stars, planets, and in the end, galaxies.

What was before the big bang, however, isn't entirely known. Was there nothing? Was there an entire universe that got destroyed as ours were created? Nobody really know.

• 9 years ago

Ok, so first of all, because the words big bang have been thrown around a lot, often by people confused about the usage, the phrase has taken on several different meanings.

Alright, so let's start with a simple idea. Let's say that you were to look out into the night sky. You observe all the different galaxies are generally moving away from us. Not only that but the farther they are away from us, the faster they are moving away from us. In fact, everything in space is generally moving away from everything else. This is because the universe is expanding.

Now let's say that you were to calculate the rate at which the universe was expanding. You could then calculate backwards (using general relativity) to the time when the universe was much smaller. In fact, if you went back to about 14 billion years ago, you would find that the universe was entirely compressed into a single point. A singularity. A place where the mathematics isn't define. This point is sometimes called the big bang. From our calculations using general relativity, the universe would have expanded from this point very rabidly. This is also sometimes called the big bang. Also, the past and current expansion is called the big bang.

The big bang theory is the current scientific model about what happened after the singularity. It talks about what happened as the universe expanded shortly after the singularity. About how matter formed and about the general evolution of the universe.

Because there are many misconceptions, here are a few things the big bang theory is not. The big bang theory is not a theory about how the universe came into existence. It only talks about what happened after the singularity. Which is after the universe came to exist.

The big bang does not say something came from nothing. It doesn't say were the universe came from at all.

The big bang doesn't tell us what happened before the singularity. Nor does it tell us if this question even makes sense.

The big bang was not an explosion. It is either the name of the singularity or it is the name for the expansion shortly after the singularity. The expansion is an expansion of space-time. It carried matter along with it, but this matter didn't explode.

Hope that helped.

• 9 years ago

The astronomer Hubble was going over star photos trying to check out one of Einstein's more bizarre predictions - that the universe is expanding. He discovered it was true. Distant galaxies were receding from us in every direction. As a thought experiment he ran the clock backward. If everything was moving away from everything else they must have been much closer in the remote past. In fact, everything must have been just one incredibly dense single point. Something happened to cause this single dense point to "explode" or start a very sudden, rapid expansion. They called this the Big Bang.

Since then there has been a lot of research into this Big Bang and it is now accepted as the "creation event" that started our universe. It happened about 13.5 billion years ago and they've tracked what should have occurred up about a trillionth of a second after the Big bang started. They still don't understand what was there before the Big Bang happened - the nature of this super-dense point - or what happened to trigger its expansion. Work continues...

• scowie
Lv 6
9 years ago

It's a ridiculous creation myth that was devised by a belgian priest and received the support of a god-fearing american scientific community.

• 9 years ago

In simple terms it is thought that there was a small hot dense condition that exploded, sending everything into motion, and causing everything to fly away with no center point. As the point (primeval atom) got bigger it caused space and time.

• Anonymous
9 years ago

yes do you have about 8 years to study as a physics major and mathematician to understand the theory? and the arguments for it

the evidence comes form einstein's general theory of relativity that says space itself expands or contracts and telescope evidence since about 1920s by Edwin Hubble, ( they named the Hubble space telescope after him)

Source(s): not easy to understand we are still thinking about the idea
• Tom S
Lv 7
9 years ago

Yes, for instance Stephen Hawking, and Paul Davies can.

• 9 years ago

SOMETHING CAME OUT OF NOTHING that was the theory !! only ******* would accept that theory lol