The big bang and others questions

[We Never Know]

Posting this thread based on some things I have seen in other thread.

Some say there was a singularity, some say there wasn't. So what was there? What did it exist in?

When expansion happened, what caused it?(remember there is no time)
What did it expand into?(remember there is no space)

All matter in the universe, all matter was created in less than a millisecond of the big bang. What was it created from? Did it always exist?

Light is composed of photons, photon are massless particle's. How does light energy create gravity?

What its the current universe expanding into? Is it "making space" as it expands? Making more space from what.

 

[sayak83]

Posting this thread based on some things I have seen in other thread.

Some say there was a singularity, some say there wasn't. So what was there? What did it exist in?

When expansion happened, what caused it?(remember there is no time)
What did it expand into?(remember there is no space)

All matter in the universe, all matter was created in less than a millisecond of the big bang. What was it created from? Did it always exist?

Light is composed of photons, photon are massless particle's. How does light energy create gravity?

What its the current universe expanding into? Is it "making space" as it expands? Making more space from what.

Read this
What is the universe expanding into?

 

[Heyo]

Posting this thread based on some things I have seen in other thread.

Some say there was a singularity, some say there wasn't. So what was there? What did it exist in?

When expansion happened, what caused it?(remember there is no time)
What did it expand into?(remember there is no space)

All matter in the universe, all matter was created in less than a millisecond of the big bang. What was it created from? Did it always exist?

Light is composed of photons, photon are massless particle's. How does light energy create gravity?

What its the current universe expanding into? Is it "making space" as it expands? Making more space from what.

The answers to your questions are almost all "we don't know".
We have some ideas how it could have been and we are pretty sure about what could not have been.
The "singularity" is the result of extrapolating the expansion of the universe backwards and assuming that there is no force that can overcome the power of gravity. But that is also assuming that GR is reigning that domain. Quantum dynamics would not allow a singularity as Heisenberg would not agree with the notion of knowing where a particle is. (Or it would have infinite impulse.)

 

[Ella S.]

Posting this thread based on some things I have seen in other thread.

Some say there was a singularity, some say there wasn't. So what was there? What did it exist in?

We don't know yet, but we're investigating promising avenues.

When expansion happened, what caused it?(remember there is no time)

It might not be caused at all. That isn't to say that "nothingness" caused it. If there's a beginning to time, then there's a beginning to causality, too, since causality is a facet within time. So there is not anything that could have caused causality, as far as we know. It seems to be temporally impossible.

What did it expand into?(remember there is no space)

It isn't necessarily expanding into anything. The expansion of space is not like the expansion of objects within space. Some of the visual models and metaphors of the Big Bang are a little misleading on this.

All matter in the universe, all matter was created in less than a millisecond of the big bang. What was it created from? Did it always exist?

There are multiple different competing theoretical models that explain this. We're still testing their predictions to see which one is the most accurate. So we don't know yet.

Light is composed of photons, photon are massless particle's. How does light energy create gravity?

I feel like you sort of answered your own question here? It's not mass itself that creates gravity, but energy. Photons might be massless, but they have plenty of energy; it's why they can move around at the speed of light. Mass is just an easy way to calculate that energy, because mass is equal to energy divided by the square of the speed of light. That's just another algebraic notation of E=mc^2.

What its the current universe expanding into? Is it "making space" as it expands? Making more space from what.

The first question is a duplicate of the previous one, since the expansion of the Big Bang is the same as the one we are still seeing now. The answer to the second question is, as far as I'm aware, unknown.

 

[exchemist]

Posting this thread based on some things I have seen in other thread.

Some say there was a singularity, some say there wasn't. So what was there? What did it exist in?

When expansion happened, what caused it?(remember there is no time)
What did it expand into?(remember there is no space)

All matter in the universe, all matter was created in less than a millisecond of the big bang. What was it created from? Did it always exist?

Light is composed of photons, photon are massless particle's. How does light energy create gravity?

What its the current universe expanding into? Is it "making space" as it expands? Making more space from what.

You are trying, yet again, to force certainty inappropriately. It is not that "some say" there was a singularity and "some say" there wasn't, as if there are two opposed schools of thought battling it out. The Big Bang model suggests there may have been a singularity but we can't tell because existing physics stops working in the regime in question.

Light energy does not "create" gravity. Gravity is just one of the four fundamental interactions there appear to be in nature (gravitational, electromagnetic, weak nuclear, strong nuclear). We don't know why there are these four. They are just what we observe. But light exerts, and is influenced by, gravity, according to General Relativity, because although it has no rest mass it does have momentum and in GR that curves spacetime. This predicted behaviour of light has been observed.

Your question about what the universe is expanding into has already been answered. Asking it again is not going to get you a different answer.

 

[We Never Know]

You are trying, yet again, to force certainty inappropriately. It is not that "some say" there was a singularity and "some say" there wasn't, as if there are two opposed schools of thought battling it out. The Big Bang model suggests there may have been a singularity but we can't tell because existing physics stops working in the regime in question.

Light energy does not "create" gravity. Gravity is just one of the four fundamental interactions there appear to be in nature (gravitational, electromagnetic, weak nuclear, strong nuclear). We don't know why there are these four. They are just what we observe. But light exerts, and is influenced by, gravity, according to General Relativity, because although it has no rest mass it does have momentum and in GR that curves spacetime. This predicted behaviour of light has been observed.

Your question about what the universe is expanding into has already been answered. Asking it again is not going to get you a different answer.

According to University of California Santa Barbara....

"Light has energy, energy is equivalent to mass, and mass exerts gravitational force. Thus, light creates gravity, i.e. the bending of space-time"

UCSB Science Line

scienceline.ucsb.edu

As for the rest, for now "we don't know but have ideals" is the best answer

 

[Kfox]

Some say there was a singularity, some say there wasn't. So what was there? What did it exist in?

It doesn't say it existed within anything.

When expansion happened, what caused it?(remember there is no time)

From my understanding, they don't know what caused the singularity to expand. As far as time, as long as something exists, the concept of time can be applied to it

What did it expand into?(remember there is no space)

How are you defining space? I define it as a place where nothing exist. Under that definition, you can't have a place where space does not exist.

All matter in the universe, all matter was created in less than a millisecond of the big bang. What was it created from? Did it always exist?

I don't think the Big bang theory makes a claim that matter was actually created