Recent content by Boy@n

Of course it is, by definition. Universe is all of 'it', it is everything. If Universe is not infinite what is that beyond Universe? And if definitions keep changing then we know nothing.The tricky part, at least for me, is not understanding/imagining infinite/whole Universe, but the...

Sounds probable to be true... Phinds, Mordred?

Others more knowledgeable can answer this well. I'd just like to say that if expansion stops all light will eventually reach us (later than sooner I guess) and (future) we might see birth of Universe :-)

Depends I guess. If you are hammering iron to make a sword you transfer quite a lot of energy into unmovable object.

Would you expect it to be in reverse? I wonder though, is spacetime curving/defining just 3 dimensions?

I agree with the point you made, but also, since I am no expert here, while Samshorn seems to know this light speed question very well, how can I put both views together? (so they agree one with another?) see: https://www.physicsforums.com/showthread.php?p=4361004

Not my intention to sound rude, but how do we (really) know anything else outside Earth perspective? From what I saw on another forum, we even don't (really) know if light from Sun to Earth has same speed (and takes same amount of time) as light from Earth to Sun... (We just assume it does.)

Seems sensible, thanks.

OK, let's say we dump the word 'edge', aren't we left with finite object or structure in regard to observable Universe? Klein bottle looks pretty interesting and finite... But again, isn't a circle enough to present the idea that the 'surface' can be considered to be infinite even when the...

A circle too has no edge ('2D ant' walking on it can go on and on eternally) and thus can be considered to be infinite (even though I'd say a circle has finite number of points, each being a Planck length). No matter how we see the circle or a sphere, both are a finite objects, and in this...

If we didn't have all the data as we (luckily) have today (as Krauss says, in distant future spacetime will expand to the point when humans on Earth will be able to observe just our own galaxy and none other, thus thinking that our Milky Way is our whole observable Universe) then (I go on with...

Aren't the exploding stars (supernova) serving us as a cosmic 'candles', for which we know standard universal brightness, and based on the strength/weakness of brightness we receive we can deduce distance to them? And on the cosmic scale there are many supernova every night...

Of course... Though, I was speaking generally.

OK, nothing is being moved or pushed, but the distance between objects does change, so, relatively speaking, the effect to the observer on the one side is same as if the other object moved, right?

I still don't know where I picked that up, but after some searching I got this: Early dark energy from zero-point quantum fluctuations http://arxiv.org/abs/1104.3797 Zero-point quantum fluctuations and dark energy http://arxiv.org/abs/1004.1782 Could dark energy be measured in the...