why universe is very big . why all of these galaxies and stars .?
483050
Because it is infinite, as life is as well. If you were to hypothetically travel for eternity you would never come to the end. God is infinite so he made the laws of physics and the elements necessary to represent himself to spread life on and in every direction.
838886
That covers only one Galaxy - Milky Way\nThe whole universe is yet to be discovered .... by humans
476125
Huge.\n\nThere is an edge to what we are able to see and could ever possibly see in the universe. Light travels at 300,000 kilometers per second. That's top speed in this universe—nothing can go faster—but it's relatively slow compared to the distances to be traveled. The nearest big galaxy to our Milky Way, the Andromeda galaxy, is two million light-years away. The most distant galaxies we can now see are 10 or 12 billion light-years away. We could never see a galaxy that is farther away in light travel time than the universe is old—an estimated 14 billion or so years. Thus, we are surrounded by a "horizon" that we cannot look beyond—a horizon set by the distance that light can travel over the age of the universe. \n\nThis horizon describes the visible universe—a region some 28 billion light years in diameter. But what are the horizons of a civilization that inhabits the most distant galaxies we see? And what about galaxies at the limits of their vision? There is every reason to think that the universe extends a long way beyond the part of the universe we can see. In fact, a variety of observations suggest that our visible patch may be a small fraction—maybe an infinitely small fraction—of the whole universe. \n\nThis view of the universe fits with the currently popular idea that the universe began with a vast expansion of size. The idea describes a kind of undirected energy present in the vacuum of space, called scalar fields, that somehow got channeled into a process called "inflation." By conservative estimates, the universe expanded so much during this period that something the size of an atom inflated to the size of a galaxy. \n\nIf this grand idea is correct, then the universe is larger than we ever could have imagined.\n\netc...
28023
The observable universe is estimated to contain:\n10^11 galaxies, 10^21 stars, and 10^78 atoms.\n\nThe means 100,000,000,000 galaxies.
159281
Take into consideration the billions of stars in this galaxy. Then take into consideration the billions of galaxies in the local cluster. Then take into consideration the billions of clusters in the local supercluster. Then take into consideration the billions of superclusters in the local segment of the wall. Then take into consideration the billions of segments in the Great Wall. Then take into consideration the billions of walls in the Universe. It's even possible there's more than one universe! \n\nWhat do you believe? I think there is life out there. But are they sentient and advanced? Maybe. Maybe not.
384729
Greetings,\n\nThe number that would answer your question has not been named yet.  There are billions of stars in our galaxy alone, and there are billions and billions of galaxies.\n\nWe will never know how many stars there are because there are literally too many to count.\n\n-matt
1106252
speaking in all logic terms all religon aside.  The universe always was it and it always will be here in one way or another.  But before the "big bang" the universe was smaller, much smaller infact than it was before this catastrophic event.  After the big bang everything that was once very very dense and all close together, is now moving apart from eachother at a considerable rate, leaving more and more area of what we call "space".
1186033
There is only one universe, and to say it is expanding actually refers to the fact that the solar systems, galaxies, etc are all spreading apart from one another.  If you believe int he big bang theory, them think of yourself in one VERY slow explosion spreading out from that central core.  \n\nSo I guess to answer your question, it is expanding into itself.
740634
To begin, it's unfortunate that many people cannot see beyond their everyday, boring. Job, home, sleep - repeat until you get old and die. Thinking about the Universe teaches us about ourselves. As Carl Sagan always said, "We are made of star stuff!". Every single thing on Earth is made of of atom and molecules that once burned inside stars. Every atom in our bodies come from stars. Like it or not, we are directly linked to the Universe.\n\nOn average, there are 100,000 stars in every galaxy. And galaxies hang out in groups of a few hundred. If you look at very foamy suds in your sink, that's how scientists see the Universe - there are empty spaces but the white foam around the bubbles would be where all the galaxies are.\n\nRight now, the best telescope that can see the farthest is the Hubble. A few years ago, scientists working with the Hubble pointed it at one of the darkest regions in the night sky. All other telescopes saw only the deepest black. But when Hubble's images returned they saw thousands of galaxies (see Hubble Heritage - Deep Field). Light travels at 160,000 miles per second. That's pretty fast but over great distances it still takes time for light to travel. The deeper you look into space, the farther back you're looking into time. Those faraway galaxies Hubble photographed were 24 billion light years away! So we're seeing 24 billion years into the past. The Universe is estimated to be 27 billion years old so we're close to seeing the Universe in its begining.\n\nIf you have the time, check out the Hubble Heritage site. A lot of people say that seeing its images is uplifting and inspirational. Maybe these images will ease your mind.
446086
the cosmos has an end... every star and galaxy will have an and so the universe will end someday and someday.. look on discovery science for details
510802
the universe is too big dude. there has to be other life.
366792
Actually there is only one universe which encompasses everything: "All matter and energy, including the earth, the galaxies, and the contents of intergalactic space" - http://dictionary.reference.com/search?q=universe\n\nThe earth is part of a galaxy which we call the 'Milky Way'.
185861
Universe in general is the area of everything including earth, solar systems, nebulas, black holes, galaxies etc are contained within. Everything that is observable to us(human) are so far within this universe. So maybe there are more but to human.. there is only 1.
962950
This sort of question generates the highest percentage of false and meaningless responses of any other I know of in A&S forum. Here's the real poop. According to the BB model of the universe, the universe is expanding, but there is no boundary beyond which there is only empty space into which stars and galaxies are expanding into. This is a common misinterpretation due to a widespread inability to grasp the concept of curved space. On a large scale, every can consistently be presumed to be pretty much the same as it is in our neighborhood, although any conclusions about what lies beyond the observable universe are impossible. However, the volume of the universe may be either finite or infinite. This is simply not known. In General Relativity, finite *and* unbounded is not a contradiction.
297935
Big Bang is a theory that tries to explain the formation of the universe, its galaxies, its stars and planets etc.\n\nIt says that the Universe was created by an explosion of a Primeval Atom thus causing it to expand and move away from each other. This was actually based on the Hubble Law which says that Galaxies around us are expanding at speeds directly proportional to their distance from Earth, based on the observation of Edwin Hubble, 1929.\n\nIts a huge topic with lots of technical arguments and counter arguments. Here is the link that will satisfy your quest on Big Bang, atleast for starters...\n\n.:Fishie:.
249324
Of course the size of this galaxy and universe are beyond human undestanding, I know this scientist did a math formula where he put the very least possiblities of life and the number was still huge.\nEx, he did like in one galaxy there is only X planet where there is water and only X springs life and only X becomes civilized, and in the end he figurd there tons of life out there!
828819
Thats a question that physics is still trying to answer.  \nThere are 3 types of theories on how big the universe is and the shape of it.  It is either flat, meaning it will always be this large and continue forever.  There is the closed ellipse type, meaning the universe started from something, but unfortunatly will end after its reaches its max capacity and starts to shrink again.  There is still the hyperbola theory meaning that the universe started at a finite point and is always expanding.