# Why the universe has to be so big?

Just on this point I was thinking recently about the speed of light from another area of my reading. The question was asked why is the speed of light the particular speed it is ie why not 10klm faster or slower

Then it struck me from a remark made it HAS to be the exact speed it is. It is a inbuilt feature and cannot be otherwise

Consider E = mc²

We know Energy cannot be created or destroyed so it would appear what the total energy content of the Universe has ALWAYS been such (in different forms sure) but in total always the same

So extracting the energy from mass by the formula E = mc² will always provide the same amount of energy from the same amount of mass

And that will happen ONLY if the speed of light remains invariant

I'm still trying to refine the thoughts about this into more explanatory terms (rather than mathematics) but it appears to me at the absolute bedrock of physics would be the speed of light

Hang around some latest study are questioning our constants and light is one of them.

Why is the universe so small?

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Why is the universe so small?

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Not finished with the renovations yet

Work in progress

Hang around some latest study are questioning our constants and light is one of them.

I've been looking at a few of those studies thanks and if you have any links they would be welcome

Cheers

Just on this point I was thinking recently about the speed of light from another area of my reading. The question was asked why is the speed of light the particular speed it is ie why not 10klm faster or slower

Then it struck me from a remark made it HAS to be the exact speed it is. It is a inbuilt feature and cannot be otherwise

Consider E = mc²

We know Energy cannot be created or destroyed so it would appear what the total energy content of the Universe has ALWAYS been such (in different forms sure) but in total always the same

So extracting the energy from mass by the formula E = mc² will always provide the same amount of energy from the same amount of mass

And that will happen ONLY if the speed of light remains invariant

I'm still trying to refine the thoughts about this into more explanatory terms (rather than mathematics) but it appears to me at the absolute bedrock of physics would be the speed of light

^^^
Any thing's speed is constant unless something affects it & makes it different.

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^^^
Any thing's speed is constant unless something affects it & makes it different.

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I appreciate that and agree in so much as when light passes through a transparent medium it slows and one lab managed to bring light to a standstill

It's the c² part when light is at its full speed in a vacuum etc etc and its value plays a part in conversation of mass into energy which I understand makes it critical to be the speed it is otherwise you either end up with extra energy being extracted from the mass or not enough

It's as bad as a clock "ticking" faster at the top of a tall building than one one the ground floor. Why does the top floor not move into the future and what stops the ground floor slipping into the past?

Never mind why is the Universe so big/small. Why is it so weird?

Never mind why is the Universe so big/small. Why is it so weird?

^^^
Compared to what?

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Astrophysicists don't struggle with questions like this.
I no doubt got the discipline wrong.

I no doubt got the discipline wrong.
Yes, it's not science. It's religion or philosophy.

Any specific reason that the universe must be so huge?

The universe is expanding and aging. So it is growing. Though total energy is conserved.

Billions of galaxies ans trillions of stars.

Thats due to the dynamics of the universe.

And we only live in a dust - earth.

Perhaps life is possible in the earth only.

The universe is expanding and aging. So it is growing. Though total energy is conserved.
(my bold) So at T=10^-43 Secs (hope that is right) there was as much energy in that (to us) small space as there is now in the observable and unobservable universe that developed from it.

Would that be a correct interpretation?

Are there any figures that have attempted to quantify those energy levels?

(my bold) So at T=10^-43 Secs (hope that is right) there was as much energy in that (to us) small space as there is now in the observable and unobservable universe that developed from it.

Would that be a correct interpretation?

Are there any figures that have attempted to quantify those energy levels?
^^^
What do you mean by unobservable universe that developed from it?

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Why must we believe there is alien somewhere out there?

Why must we believe there is alien somewhere out there?
Well there is no must about it

Nobody knows and people form their opinions from the numbers

I look at life, look at conditions around the Universe, look at how many of those conditions appear in how many trillions of regions and conclude (but refrain from a "knowing" pronouncement) life could be out there

Nobody should fault you for holding a different view since as mentioned nobody knows

What do you mean by unobservable universe that developed from it?
Well if we take our assumption as to what the universe looked like at T+10^-43 secs we then assume that it expanded and evolved to what we observe today.

That is the observable universe.

However ,owing to expansion distant parts of the universe are moving away from us so fast that the light from them will never reach us and this is the unobservable universe I was referring to.

This part of the universe presumably had its origin in the same event as the observable universe (debatable but I have assumed as such)

Did I answer your question? (perhaps you thought I was referring to Dark Mass;I wasn't)

(my bold) So at T=10^-43 Secs (hope that is right) there was as much energy in that (to us) small space as there is now in the observable and unobservable universe that developed from it.

Would that be a correct interpretation?

Yes.

Are there any figures that have attempted to quantify those energy levels?

As per physicist, the total energy of our universe is zero.

As per physicist, the total energy of our universe is zero.
As far as I know, this is merely a popular hypothesis, not a scientific fact.

As far as I know, this is merely a popular hypothesis, not a scientific fact.