what is  the fa rest galaxy(world) that human could saw so far?how many far?
375722
Abell 1835 IR1916 is the furthest galaxy that humans have found so far. It is 13.2 billion light-years away.
67361
At least 100 billion galaxies are known to exist in the Universe. Our galaxy is a spiral one, so in terms of structure it consists of galactic core and several spiral arms. In terms of composition it includes stars, planets (made from regular matter, including atoms of all naturally occurring elements and ions), galactic gas and dust (made from regular matter, mostly hydrogen and helium as far as the gas goes, and hydrogen, carbon, silicon, oxygen and some other elements as far as the dust goes), dark matter and dark energy (there is little known about the last two).
683582
There are about a couple hundred billion stars in our galaxy. The stars close to the center are not likely to have planets because of dynamical considerations (other stars pass by too frequently to have stable orbits).\n\nThe BIG question is how many planets there are per star on average. Our sun has ten planets and assorted other objects. We have found many other planets orbiting other stars, but most of those stars have only one planet (that we have detected). One has three planets that we know about. HOWEVER, the way we detect these planets favors detecting large planets that are very close to their star. Once you start to ask about planets as small as Saturn, or that are farther away than Mercury is from our sun, the methods don't work so well.\n\nThe upshot is that we really just don't know how many planets a typical star has. Some probably have none. How many have none? We don't know. How many have ten smallish planets? We don't know. At best we can guess, say 4-5 on average. This would give close to a trillion planets in our galaxy. The number could easily be a tenth of this, though.
1123060
Maybe somewhere, we will probably never know! There is a high chance that in another galaxy though that there is another inhabitable planet similar to earth with life living on it, i cant believe that it has only happened to one planet in one galaxy in all of space! That would just be madness!
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
84637
We are part of the Milky Way. Excluding the Milky Way, the closest galaxy is the Andromeda Galaxy with possibility that the two galaxies may collide within the next three billion years. It is currently 2.5 million light years away.
26403
The farthest thing you can reliably see is the Andromeda Galaxy, which is about 2.5 light years away.
832530
Here are the facts.\n\n1. The closest Galaxy is the Canis Major Dwarf galaxy\n2. The Canis Major Dwarf galaxy is 42,000 light years away.\n3. Traveling in a conventional space craft would take   \n    approx   4,927,184,640,000 years at 50,000 mi/hour\n4. Using light sails (a cutting edge untested technology)\n    a craft could travel as fast as 25% the speed of light.\n5. At 25% the speed of light it would take 168,000 Earth years to\n    reach the Canis Major dwarf.
113742
No one can say for certain. Matter of fact we don't know exactly how many stars there are in our own Milky Way Galaxy. Most guestimates for the Milky Way run to about 250-billion stars. Then there are about 250-billion other galaxies in the observable universe, each with more or less 250-billion stars each. A reasonable ball park figure for total number of stars in the observable universe would be approximately---approximately!---   5^22. That's 5 followed by 22 zeros.
263080
Hmmm...14 hours later and no one answered - "A long time a go in a galxay far, far away..."?\n\nIn one reality or another, yes, Star Wars is ancient history, current events, AND things yet to come. If you think I'm wrong, look into string theory. Go ahead, look it up. It'll blow your mind.
670477
There are 1019203948105 Galaxies...\n3 more are to be developed next year, and will be released on the 3rd of march.\nCool isn't it?
385472
Our Universe is the only one that we know of.  Within our universe are at least a hundred billion galaxies.  Within our galaxy (assuming it is normal) there are a hundred billion stars.  That gives us (assuming the averages hold true) roughly 10,000,000,000,000,000,000,000 (ten sextillion) stars in the known universe.
596996
Out of 10,000 Billion Galaxies out there. No Doubt there is something out there.\n\nEarth will contact something...but not in our lifetimes.\nI even believe there is another planet like ours out there somewhere.\n\nWe would be very naive to think we are the only intelligent planet in the entire Universe.
1005881
There are _trillions_ of stars in the Universe.  Our galaxy, the Milky Way, is composed of 300 - 400 billion stars.  There are _billions_ of galaxies in the Universe, many dwarfing the size of ours.\n\nThe chance of other life _not_ being out there is so close to zero that it can't even be calculated.  There are infinite possibilities in this Universe, and we haven't begun to study more than a tiny bit of them.\n\nTo anybody that has the audacity to say "no" there isn't, then get an ego check.  We aren't the only intelligent life in a Universe of infinite possibilities.
705687
One estimate is 156 billion light years wide.\n\nhttp://www.space.com/scienceastronomy/mystery_monday_040524.html
435314
The nearest galaxies to the Milky Way are two Magellanic clouds, LMC and SMC, and they are UNFATHOMABLY far away.  LMC is 50 kpc away, or about 160,000 LY.  JUST ONE LY is SIX TRILLION MILES.  So 960,000,000,000,000,000 miles away.
39505
That's a tough answer for even astronomers to estimate accurately. I've studied astronmy for 30+ years and it seems that the most common answer is between 200 to 400 billion. What's kind of funny about that is it seems to be really rare to read an article that says there are about 300 billion stars in the Milky Way. I have no idea why that is- strange huh? It is more common to read the number 200 billion though. Remember nobody actually counts them unless a computer does it. It's just an estimate based on a number of different obsevations. There is a lot of our galaxy that can't be seen because of interstellar dust and gas. We can't even see the center of the Milky Way from here with our eyes. We can only look towards the center which is in the constellation of Sagittarius.\nWe can see the center and other obscurred areas using different wavelenths of light that the human eye can't see, but it's still hard to pin down a close number with accuracy.