Recent content by Lohan

I am trying to get my mind on this but still can't . I just read the definition of the Hubble sphere in Wikipedia: https://en.wikipedia.org/wiki/Hubble_volume It says this: "More generally, the term "Hubble volume" can be applied to any region of space with a volume of order {\displaystyle...

I did read it but don't get it.

Can you guys actually visualize this concept of different Hubble volumes for different observers in your minds, or is it something purely mathematical (as a result of mathematics of general relativity) or abstract that we cannot actually visualize? Is there like a drawing on this you can point...

I read here, http://www.space.com/24781-big-bang-theory-alternatives-infographic.html , that, "What we call the "observable universe" (or the "Hubble Volume") is the spherical region, about 90 billion light-years in diameter, that is centered on any given observer. This is the only part of the...

pervect, why would the communication signals get red or blue shifted in this special case. B is rotating around A. So, when B sends a signal to A, isn't it just coming at A in a straight line? Because B moving at .5C with respect to A in a circle. It's not that B is moving away or towards...

So, they use radio communication. Fine. So, B is rotating around A at .5c and talking to A. Both are talking to each other. But doesn't it cause a problem when they start communicating? If A is aging much faster than B, then how can they talk? Geostationary satellites travel at very low...

So, does this mean that B will see A age faster like what we see when we fast-forward a VCR tape? Will they be able talk to each other? Say, there is a long fiber optics communication cable fixed between A and B which rotates with A and B. Now, will they be able to speak to each other, if...

Thanks for the very quick reply. Yes, I mean B is rotating around A at a speed of .5C. I have a small experiment, like a thought experiment as such: Instead of meeting each other, what if B has a very powerful telescope that can see the clock of A from his spaceship. Similarly, if A has a...

I like a to ask a very simple question. I have read about time-dilation when it comes to SR. So, like: (1.) A and B are are rest and close to each other. (2.) B starts traveling at .5C relative to A, away from A, in a straight line. (3.) B comes back at .5C towards A. Now, according to SR, A...