Do we know for certain that the whole universe is expanding for a fact? or do we just know for certain that the milky-way galaxy is?
If the whole universe isn’t expanding or even expanding, but at a rate that either dark energy of gravity pulls it all back to the perfect equilibrium state of masses, then the universe will try to pull itself back into its original state. Everything back into the order of physics and natures liking. Putting the heavy atom/elements back into the middle and light atom/elements on the outer surface. (I think the super light elements will be crushed or compacted back to a heavy state from the massive amounts of gravity) After trillions of years the whole universe will be the same temperature as it started. (Possibly being cooler from all the transfers of energy, and that we loose heat from planets that don’t have an atmosphere) It’ll go back to a huge ball similar to a gigantic black hole. Letting nothing escapes its gravity pull staying like this for the rest of eternity or exploding again exactly like the big bang! (this is just my theory from what I know)
Its all a huge cycle and we are just starting life somewhere on this huge circle. .001%-49.99% mark in the cycle if we are still expanding. If we aren’t expanding and not contracting, than we are at a stop which is somewhere close to 50%. Which is at the middle of this gigantic cycle. If the whole universe is collapsing on itself than we are 51%-99.99%.
Obviously we aren’t anywhere near 90% because of the huge spaces in between galaxies and planets. and we aren’t close to 10% because of the same reason! we have to much empty space in between masses. It really depends on if we are expanding outward or inward. Not from the view point of our galaxy but from the middle of our whole universe.
So where are we? (this theory only works if the universe will ever have enough energy to collapse on itself. If the explosion overcomes gravity than the universe will always be spreading outwards, because the pull of gravity isn’t strong enough to ever stop it.(ratio of the masses moving outward/strength of gravity) If the masses moving outward is stronger than the power of gravity than we will forever spread outward. Slowly gaining speed. But if the power of gravity can over come and slow the masses to a point of stopping them, then the whole universe will pull itself back in. Or even the possibility that the strength of the momentum moving outward and gravity are at an equal then we will forever stay at the speed we were released from.
Right? This is my theory but I want to know what you guys think. If you see any flaws or disagree in anyway please tell me because I really want to see if I can spiff it up! Also if you have any facts that my ideas work I would love to see them!
@kwelch5528, Yes everything we see is accelerating away from us. It is expanding, at an increasing rate. Which makes no fucking sense.
This is attributed to “dark energy” – which has nothing (well, you know) to do with dark matter. They just use dark because we have no idea what either of them are.
Ok so the universe is expanding but at some point won’t it slow down and come to a complete stop? Even after it stops gravity is pulling just as hard as ever, so won’t everything be heaved back to the same exact point as it originally started?
I heard somewhere that we are accelerating to fast for gravity to pull all the mass back in? but how strong is the central gravity? Won’t it just keep getting stronger with the masses it is able to pull back. Also do we not know all the physical attractions that take place in space. We literally base everything off what we know, calling it good. I need to study on dark energy which is going to be hard considering we know very little. It would be very interesting to see if this dark matter/energy plays a key role in the explanation of the universe.
@kwelch5528, IJC is right. Also, the Milky Way isn’t expanding. I’m sorry I don’t want to point out all the inaccuracies in your first post, but there are kind of a lot. I really like that you’re interested in astronomy/physics and the universe. I am too, we should talk more about that subject. I can tell you don’t have a lot of knowledge of physics but you’re really interested. I could give you a ton of different links to videos/articles/websites/books/pages/etc. if you’d like.
@kwelch5528, The force of gravity pulling all the different galaxies together will decrease the farther apart they get. This is newton’s law of universal gravitation. The “r” on the bottom is for radius between two masses. So as galaxies spread apart, the radius between them increases, which increases the denominator of the equation, which means a smaller number (smaller gravitational force).
As for dark energy, the thing is, galaxies are not only moving apart, but accelerating. We know things cannot accelerate unless there is a force acting upon them. (F=ma, where F=force, m=mass, and a=acceleration. If F=0 then there would be no acceleration). This means that something is pushing the galaxies apart, which we can’t see at all. Hence the name “dark energy.” Hope that helps!
i dont think that the universe has a central gravity?! every bit of mass has its own gravity of course but i dont think that there is really a center… and no matter where you look, everything is expanding away from us at the same exponential rate. so when we look to left of us were not moving away from it any faster or slower then to the right of us or above or wherever. so i dont think that there is any way gravity is strong enough to slow us from expansion and were being repelled from everyting else like magnets . i think were stuck forever expanding :O
@alexishungry, I would like all those video about physics, What I don’t get is how some galaxy clusters form? from picture representations of the whole universe it seems that the “middle” is much more dense. And some branches are much thicker, it seems like from the initial bang that masses would be launched outward in an evenly manner. Is their something I’m missing?
you should join my Google plus community! I think you would enjoy it and I want to see what you know and how you think. It would be very cool if you explained to me from your perspective of the universe! seems like you know the mathematical side of things.
@jshmedler, I also think that in doesn’t have a central gravity but it seems that their are huge clumps of masses in what I think is the middle. It could very much be no where near the middle but they seem to be everywhere. Is that because of some of the gas/dust materials “won” the gravity battle and combined to make a stronger gravitation. Over the trillions of years it slowly started to clump back together?
@kwelch5528, You can start watching this http://www.youtube.com/watch?v=jRIJjffrHIM and this http://www.youtube.com/watch?v=ELO7Gu5quWQ to answer your question about galaxy formation. Thanks, I’ll join your Google plus community too. Just send me a link.
When you say it looks dense in the middle are you talking about the WMAP radiation picture http://map.gsfc.nasa.gov/media/poster2002/WMAP_poster2002a.jpg ? Because the thick line you see in the middle of the low frequency pictures is the milky way galaxy. We are in the middle of it, which is a relatively flat spiral galaxy, so when we look outwards to the rest of the universe, the milky way gets in the way of part of our view.
https://plus.google.com/communities/115690845615764353209 this should be the link to my community! check it out you’ll fit in great!
What I mean by dense is the fact that some galaxy clusters are much more condensed with solar systems that it seems gravity (or something) has “won” in that area. Meaning their is so much more masses and huge suns that it seems like everything close gets pulled in! From what I know the sun and even the earth gets more mass everyday just in very small increments.This is just from small asteroids colliding into the sun to add more mass. After a billion or so years it could very well double in size. So would the suns gravity pull strength in microscopic scale every time this happens? Wouldn’t these suns just keep getting bigger until everything is orbiting them? (kind of)
@kwelch5528, The sun is losing mass. Energy and mass are ‘equivalent’, and the sun dumps out enormous quantities of energy continuously. It would take a very, very long time for the sun to lose all of its mass this way.
The sun is increasing in volume, however, as internal gravity is fighting a losing battle.
@kwelch5528, The universe is expanding – and it is accelerating as I said in my first post. This means it is getting faster and faster in expansion – nothing is showing us that it will ever slow down, or even stop accelerating, in fact.
So I don’t know where you are getting any of your information or hypotheses, but they aren’t in line with our current understanding and observations of the universe.
You might find this graphic appealing; the very right is where our understanding of the universe is right now.
The fact the universe is expanding in itself raises many questions, since it requires a constant energy source… Or, an omnipresent force that expands outwards.
However, what is even more confounding is the universe seems to have “exploded” in the big bang, and the expansion was decelerating, but at some point in time, it shifted, and began accelerating.