Expanding Definition and 625 Threads

I was just listening to 'The galaxy song' by monty python and I got thinking. The general belief (i think) is that its relatively early after the big bang and the universe is expanding, but what proof is there that we're not compressing? that we're already in the second stage of the universe...

If the Arrow of Time move's upwards from 'our' perceived 3-D +1 spacetime (expansive Entropy), then in this model:http://arxiv.org/PS_cache/hep-th/pdf/0408/0408217.pdf Has the implications that the Arrow (Thermodynamic Time) predicts that from a 5-D Space, relays an arrow of Time converging...

Somewhere on the web I read that as new matter is captured by a black hole, the event horizon expands. But as it expands it does not engulf the matter that previously accumulated close to the horizon. Instead all that matter is carried outward along with the expanding event horizon. But...

Would we be getting older faster if the universe wouldn't be expanding?

Please excuse the simplistic approach to the following question. If one accepts that the universe is indeed expanding could this not be simply because the relative strength of gravity has or is diminishing? Instead of suggestions of dark energy and or dark matter to make equations make...

WMAP has conclusively proven an expanding universe. anyone care argue?

Can anyone explain howcome the ratio of expansive space always has the above Ratio? If there is a backgound of space that is expanding exponentially, then any Space that is Contracting with a photon pressure seems to always be 2 to 1. For the ignition of Stars, this would correspond to a...

Can you tell me what the following formula will be after it gets expanded ? (1+x+x^2+...+x^n^-^2+x^n^-^1)^2 = ? Thanks a lot,

hi every one. i was on my way out of my astronomy class today and i hit my self with an odd question. The universe is expanding and as a result it is cooling, now i was wondering if the universe expands infinitly then would it be possible for it to cool infinitly as well. eventualy reaching...

If the universe were divided into two mass zones, and one zone repelled the other,supernovae would not only accelerate away from us but the zone in which we are living would accelerate away from the supernovae.Also cosmic rays could be repelled by one zone and pushed through another.Could...

Hello all, I am from Amsterdam, the Netherlands. I am an super-amature on this topic but I have a question. Is it not possible that the universe is expanding because the amount of matter is growing? See it like a bucket filled with water(universe), throw a rock(matter) in the bucket and...

OK. Suppose you have a surface with a closed curve as a boundary. Then suppose that surface grows like a soap bubble but the boundary is stationary like the orifice through which air passes to make the bubble grow. It would seem that the 2D surface grows in both dimensions in the middle of the...

Gosh, I can't stand the new look. Q. Place a 1 kg block of iron at 40 degrees C into a kg of water at 20 degrees C and the final temp will be: More than 30 degrees C, Less than 30 degrees C, At or Around 30 degrees C. I felt it would be At or Around 30 degrees C, because I tried to do an...

There is some discussion about the expansion "of space" in a thread that actually belongs to a different topic so I thought I'd start a thread about that with my input here. Consider the Robertson Walker metric in the following form ds^2 = dct^2 - \frac{R^2}{R_{0}^2}\frac{d\rho ^2 + \rho^2...

Help me please! do'nt know if I'm right here, but any hint leading to a simple answer of the following question would be appreciated: if the universe is expanding, are we expanding as well? does my hand expand at the moment? what about a center of expansion? what about our point of...

Help me please! do'nt know if I'm right here, but any hint leading to a simple answer of the following question would be appreciated: if the universe is expanding, are we expanding as well? does my hand expand at the moment? what about a center of expansion? what about our point of...

Hi, I have read a bit about open, closed, and flat universes, Hubbles Constant, the accellerating universe, big bag, big cruch, etc... Is it possible that the expansion rate (+ or -) of the universe might be independant of the expansion rate (+ or -) of the matter within it? Is it...

the universe is expanding, ok. but what is causing this? the big bang? in that case, what causes the expansion to accelerate or decelerate? and what is beyond the boundaries of the universe?

We are told that as the Universe expands, the 'temp' of it cools and we now have the microwave background radiation as a remnant. Fine. Considering the energy density of the universe, energy is indeed conserved as it expands and cools. However, what about an individual photon, who's...

edit. if space is expanding how can the electrical properties stay constant?

What is your opinion on this hypothesis ? http://www.wincom.net/earthexp/n/navback.htm http://users.indigo.net.au/don/ee/nav.html http://www.expanding-earth.org/ http://www.geocities.com/CapeCanaveral/Campus/2730/...

I may be out of touch, but I don't think I've ever read it for sure so what are your theories on this? I mean the big bang theory may provide the inertia to expand but why at an accelerated rate? What force is being added if any to accelerate this expansion and where does it come from?

http://www.Newtonphysics.on.ca/faq/flat-universe.html this may be old news to some of you but it does show a differant side of the coin

How is it that we are able to see galaxies that are billions of light years away considering that we are presumably traveling from the same origin? Would that somehow mean that the distance between the two galaxies was growing at a rate greater than the speed of light? If not, why not? The...

What's the reason for it? Is there a mechanism already existing in physics to explain it, such as virtual particle energy density, to account for the anomalous acceleration? Will such an explanation solve the mystery of the acceleration of the Pioneer spacecraft ? To know we've got to solve...