The speed of light, etc

[Sirius]

OMG why did i look at this thread, i now need to have a little lie down

Originally Posted by Sephiroth

I doubt the big bang theory; I'm of the school that everything has always been there, in one form or another.

One does not discount the other.
There seems plenty of evidence the big bang happened.
However, whatever went "bang" was already in existance.

[Jaymoss]

Originally Posted by Paul

One does not discount the other.
There seems plenty of evidence the big bang happened.
However, whatever went "bang" was already in existance.

and there within is the crux .

What ever was there before ( even if it is matter in an ever expanding contracting exploding universe) must always have been there which to our linear mortal brains is impossible

[mrmistoffelees]

One i haven’t got my head around yet is how the Big Bang and Big Crunch theories work together, according to the second law of thermodynamics the total amount of entropy in an enclosed system (which the universe is) can only remain constant or increase never decrease.

So, if if entropy increases in a big bang Big Crunch scenario where does it come from ? & if entropy remains constant what happens to matter if it crosses the event horizon of a black hole ? It must come out? Hawkins radiation ?

[GrimUpNorth]

Can someone explain how something infinite (the universe) can be expanding?

[Jaymoss]

Originally Posted by GrimUpNorth

Can someone explain how something infinite (the universe) can be expanding?

The universe in theory isn't infinite what is is expanding into is . Although even nothing is something and if it is nothing it goes on forever (maybe) re end scenes of Men in Black

[GrimUpNorth]

Originally Posted by Jaymoss

The universe in theory isn't infinite what is is expanding into is . Although even nothing is something and if it is nothing it goes on forever (maybe) re end scenes of Men in Black

So what is it expanding into and how would you know where the edge of the universe is and when you'd crossed over to the infinite expanse outside?

[mrmistoffelees]

Originally Posted by GrimUpNorth

So what is it expanding into and how would you know where the edge of the universe is and when you'd crossed over to the infinite expanse outside?

The universe can’t expand into something because it’s everything , there is no edge

https://www.newscientist.com/lastwor...xpanding-into/

[Sephiroth]

Originally Posted by GrimUpNorth

So what is it expanding into and how would you know where the edge of the universe is and when you'd crossed over to the infinite expanse outside?

I've worked that one out - at least to my satisfaction. There must be somewhere in space where no matter exists (yet). So I should be theoretically able to get there. What would I see? I believe you'd see everything you see now because the totality of the material universe bends light.

[spiderplant]

Originally Posted by mrmistoffelees

There are elements of the universe that we will never observe as it’s light will never reach us

How do you know?

[mrmistoffelees]

Originally Posted by Sephiroth

I've worked that one out - at least to my satisfaction. There must be somewhere in space where no matter exists (yet). So I should be theoretically able to get there. What would I see? I believe you'd see everything you see now because the totality of the material universe bends light.

Let’s dissect this for fun

1. Somewhere in space where no matter exists would imply containment and the universe expanding into something
2. If you can’t travel faster than the speed of light and galaxies are being pushed apart faster than the speed of light how do you reach this area ?

Mind you it could be turtles all the way down for all we know….

[Sephiroth]

"Can't travel faster than the speed of light" relative to what?

I mean - is the Universe really expanding just because the red shift of light emanating from a known galaxy has red-shifted further? And when we can no longer observe the other galaxy that is moving away from us, is that because we don't have the instrumentation to detect lower and lower electro-magnetic frequencies?

And, what is dark matter? Is dark energy the the counterpart to E-MC^2?

[mrmistoffelees]

Originally Posted by Sephiroth

"Can't travel faster than the speed of light" relative to what?

I mean - is the Universe really expanding just because the red shift of light emanating from a known galaxy has red-shifted further? And when we can no longer observe the other galaxy that is moving away from us, is that because we don't have the instrumentation to detect lower and lower electro-magnetic frequencies?

And, what is dark matter? Is dark energy the the counterpart to E-MC^2?

Speed of light (in a vacuum) is a constant therefore relative to everything , however there is no reference frame that can be applied IIRC Newton & Einstein stated this (although I may have butchered it somewhat)

Point 2 those bloody turtles again

"The turtle* moves!"

*Great A’Tuin

[joglynne]

Cosmic turtles and elephants....... just saying.