how big is universe ?

@athousandyoung said
You’re wrong because there is no difference between us moving away from an object and an object moving away from us

@Metal-Brain
And why do you think that fundamentally matters? The main thing is the recession velocity, it matters little who is going away from whom.

@sonhouse said
@Metal-Brain
And why do you think that fundamentally matters? The main thing is the recession velocity, it matters little who is going away from whom.

@metal-brain said
That is exactly what I said

@sonhouse said
@Metal-Brain
And why do you think that fundamentally matters? The main thing is the recession velocity, it matters little who is going away from whom.

@shallow-blue said
It matters a lot - because it's neither. It's relative movement, not one moving away from another.

@metal-brain said
None of you can explain why I am wrong but you are the last word. Right.
Tell us again why you think time dilation is the result of gravity.
Simply tell us all why gravity would cause time dilation.
We are all waiting.

@suzianne said
Strap this one on for size.

According to Einstein, there is no difference (at least you cannot tell from inside a spaceship) between sitting on a planet with 1x Earth gravity and traveling through space at a constant 1G acceleration. Either way, with sufficient speed OR gravity, you will experience time dilation. Since you can experience time dilation without gravity, t ...[text shortened]... s not cause gravity. In fact, it is gravity (OR acceleration) which causes time dilation.

Savvy?

If we cannot see light from galaxies in the distant universe it does not prove the universe is expanding faster than light. It is possible there is no light there to see there, but let's assume there is light and it has not reached us because it is too far way. That would prove 2 things.

1. Our galaxy is not anywhere near the center of the universe.
2. The universe is expanding more than half of the speed of light

Think about it. It will come to you.

Mate, you're so far out of your depth, you're not even in the swimming pool any more.

@shallow-blue said
Mate, you're so far out of your depth, you're not even in the swimming pool any more.

@metal-brain said
You don't know the difference between a radius and circumference, do you?

@metal-brain said
" Since you can experience time dilation without gravity"

That proves nothing. I refer you to the equivalence principal.

" In fact, it is gravity (OR acceleration) which causes time dilation."

False. It is both.

This is the last time I will correct your nonsense.

@metal-brain said
You don't know the difference between a radius and circumference, do you?

@metal-brain said
If we cannot see light from galaxies in the distant universe it does not prove the universe is expanding faster than light. It is possible there is no light there to see there, but let's assume there is light and it has not reached us because it is too far way. That would prove 2 things.

1. Our galaxy is not anywhere near the center of the universe.
2. The universe is expanding more than half of the speed of light

Think about it. It will come to you.