Astronomy and Cosmology

Is time of the same measure throughout our universe & beyond? Or are there different sorts of measures? I only understand time as I was brought up with it & take it for granted,but is our time the same measure as for everywhere else?....us.2u

http://www.metaresearch.org/cosmology/speed_of_gravity.asp I would love to know if this could be possible also I remember in my youth riding a pedal cycle at night seemed to be easier than riding in daylight & sound seems to travel further when it's dark; is this just imaginable or maybe light does slow things down slightly? And if gravitity is faster than light can we somehow store it for space tr avel?...us.2u

so far there are only 2 theories of how the universe will 'end' 1- The big crunch: the gravity in the universe is so powerful that over-powers the expanding universe and it all comes back to one place and eventually we have a reverse-big-bang 2- The Big Freeze: the universe will continue to expand and all stars will eventually burn out and the universe will become dark, frozen, and time will have practically stopped. do i have this info right? wrong? close? Please add-on or correct this.

Before we get started I want to say i'm just a 3rd year HS student here to learn. Now onward. I cant remember where i heard this but, i heard a multiverse my exsit. I'd just like to here what everyone thought on that

Space is not my strong point so any answers are appreciated. There's a question that I have been pondering about. I really have no idea if this has been talked over about somewhere but at least the recent threads didn't seem to exactly concentrate on this so here it goes: If we suppose that empty space is infinite (our universe is just the part of space where matter has "expanded" since Big Bang). Couldn't this mean that after the point where "Big Bang matter" ends is reached and went past of, through the empty space, there comes another universe originating from another Big Bang. Let us further assume that these new universes where the like of ours. Couldn't this me…

hey..im currently working on a big research papaer talking bout the shape of the universe..i jus started and im alreayd confused..it seems that ther are three posibilities for the shape and that the universe is flat.what does this mean? flat would mean having a single flat plane..but how is that possible when space time actually curves..i mean isnt the universe have depth to it? how can it simply be flat..please help!

Looking at the Friedman solution for a fluid with a given pressure and energy density, we have: [math]H^2 = \left(\frac{\dot{a}}{a}\right)^2 = \frac{8 \pi G}{3}\rho + \frac{\Lambda}{3} - \frac{k}{a^2}[/math] Would someone mind walking me through how we arrive at a? Rev Prez

The Pioneer 10 and Pioneer 11 spacecraft, the ones which are mysteriously slowing down... http://archives.cnn.com/2001/TECH/space/05/21/gravity.mystery/ Anyway, I was at the Mill Hill Observatory (I got to use the Radcliffe telescope: http://www.ulo.ucl.ac.uk/telescopes/radcliffe/ or image here: http://www.ulo.ucl.ac.uk/images/ulo_photos/rad_modern.jpg it's the only time it has ever been open to public (it was open because of national science week)).... back to the topic!... I was talking to a PhD astronomy/cosmolgy guy and asked him about what he thought was the 'mysterious force' acting on the Pioneers, he reckoned, off the top of his head, either mathematics error…

I've heard this term, but am unclear on it's exact definition. I think it implies that the entire universe as we know it is just one "volume" inside of a larger universe. Is that an even remotely accurate definition?

While trying to help someone else in another thread I posted a Link for them to go to. They were trying to draw a map. What intrigued me is the Great Wall of galaxy cluster shown. I started this new thread to see if anyone has any theories about it. This is the map http://www.astro.princeton.edu/~mjuric/universe/ This is more info about the Sloan Great Wall http://emystics.org/newscienceparadigms/astro/great_wall.htm

this is a lively ongoing line of research in LQG a new paper by Bojowald et al just came out this month http://arxiv.org/gr-qc/0503041 A black hole mass threshold from non-singular quantum gravitational collapse Martin Bojowald, Rituparno Goswami, Roy Maartens, Parampreet Singh 4 pages, 3 figures Report-no: AEI-2005-020,IGPG-05/3-3 "Quantum gravity is expected to remove the classical singularity that arises as the end-state of gravitational collapse. To investigate this, we work with a simple toy model of a collapsing homogeneous scalar field. We show that non-perturbative semi-classical effects of Loop Quantum Gravity cause a bounce and remove the classical…

Hi all, i'm not sure if this is the right forum for this but i think its more of an astrophysics question. Can somebody please give me the gist of dark matter/ dark energy? Is it like antimatter or what? Thanks in advance ~Scott

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Just a personal possible theory here. But what if instead of out of nothing came the Big Bang, that the Universe was just one Big Solid Mass with no Space. Then at some point a fracture occured. So therefore all the Mass we see has always been. The Space inbetween is what's new. Sorry for the lack of scientific terminology here.

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If not what is a planetary body? What do we consider a plantery body?

http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Riemann.html to be accorded the right to lecture at the university Riemann had to present a talk on something he prepared 3 lectures, two on electricity and one on geometry, and he let Gauss choose which he should give Gauss chose the one on geometry this talk was on the foundations of geometry and it showed how a space can have shape and curvature and all that good stuff without living in any larger surrounding space and without having any boundaries this talk was given in 1854 Georg Friedrich Bernhard Riemann lived 1826-1866. He was extraordinary creative, like Mozart, except it was in math ins…

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This might be the hardest question ever because it's questioning the size and dimensions of the universe. If the universe is infinite (space-time is flat and Euclidean), this simply means there never was a big bang at all. But if the universe is finite (space-time is curved and elliptic) but unbound (eternal but not infinite in size) then we, as 3D creatures, will never be able to see what lies beyond. A NewScientist article implies that the universe is finite but unbound.

Earth years - is this true or false.

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Does anyone know; were the Dinos the first walking animals on this planet? I believe they survived about 50 million years is that right? And I'm really confused to as how long have we've been around... some say only a million years yet fossils say we've been around for about 4 million years does anyone out-there know for sure?...us.2u

measusing changes in the apparent wavelength of lines in their stras spectrum (the radial velocity method) True or False?

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Take a look at these pictures. I hope everyone can access them, they came off the AOL home page. http://rl.channel.aol.com/space/hubblegallery Edited: I checked it from the Foxfire browser and it seems that you will need an AOL screen name--sorry.