What is Digg?Sponsored by Lost University
LOST Season 5 lands on Blu-ray(tm) & DVD for the first time view!
lostuniversity.org/ - Follow the twist and turns of Lost in this 5-disc collection. Perfect gift for lost fans.
61 Comments
- Feenix566, on 04/29/2009, -0/+21Space everywhere is expanding at the same rate. So, a beam of light originating 1 light year away takes slightly longer than a year to get here, due to the expansion of space that took place in the space through which it was moving during the time it was moving towards us. A beam of light that originated ten thousand light years away takes quite a bit longer than ten thousand years to get here. The farther away the point of origin, the more space is between us, the more expansion is taking place during the trip. As we keep looking farther and farther out, eventually we reach a point at which the amount of space between us and a beam of light's point of origin is so much that the space is expanding faster than the beam is travelling. Thus, the beam will never reach us. That point is 78 billion light years away.
It's important to note that just because we'll never see anything that is farther away than that (unless we develop faster than light travel) that doesn't mean that nothing exists that far away. The universe is infinite. The perceivable universe is 78 billion light years around us. - hauntedchippy, on 04/29/2009, -0/+18Space, the final frontier, it seems to go and on forever but then you get to the end and a gorilla starts throwing barrels at you.
- inactive, on 04/29/2009, -0/+16they never talked about disproving god's existence...
- futimazar, on 04/29/2009, -2/+14Wouldn't you actually have to actually prove it first? Please keep your fairy tales out of science please.
- raydeen, on 04/29/2009, -0/+10Space is big. You just won't believe how vastly, hugely, mind- bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.
- Hockey13, on 04/29/2009, -0/+9The truth is disturbing:
http://en.wikipedia.org/wiki/Universe#Size.2C_age. ...
I'm no physicist, but I believe this expansion faster than the speed of light is part of an early period in the universe known as "inflation." Note how the following is simply a "lower limit."
==============
The comoving distance from Earth to the edge of the visible universe (also called particle horizon) is about 14 billion parsecs (46.5 billion light-years) in any direction.[2] This defines a lower limit on the comoving radius of the observable universe, although as noted in the introduction, it's expected that the visible universe is somewhat smaller than the observable universe since we only see light from the cosmic microwave background radiation that was emitted after the time of recombination, giving us the spherical surface of last scattering (gravitational waves could theoretically allow us to observe events that occurred earlier than the time of recombination, from regions of space outside this sphere). The visible universe is thus a sphere with a diameter of about 28 billion parsecs (about 93 billion light-years). Since space is roughly flat, this size corresponds to a comoving volume of about:
4/3 x pi x R^3 = 4 x 10^32 ly^3
or about 3 x 10^80 cubic meters.
http://en.wikipedia.org/wiki/Observable_Universe#S ... - sindex, on 04/29/2009, -0/+8lol @ stupid trolls commenting on things they clearly didn't watch, or couldn't comprehend
- oteque, on 04/29/2009, -0/+7great video! but for some reason I kinda lost in the dark :)
- crgnetworks, on 04/29/2009, -0/+7PLEASE, anymore videos like this?
- Irishsmurf, on 04/29/2009, -0/+7Big numbers, My head hurts.
It is amazing at how small, how insignificant we really are. - nullcodes, on 04/29/2009, -1/+8Uh, the way I understand it .. and I haven't actually looked at this issue as much as I should have .. the answer is both "yes it is" and "no it isn't" (who says physics can't contradict itself). The space between us and distant galaxies is increasing faster than the speed of light, however nothing is moving in a manner that can overtake a photon. Get it? Yes? OK that must mean you have a misconception. Anyway .. take a look at:
http://arxiv.org/PS_cache/astro-ph/pdf/0310/031080 ...
That article may clear up some confusions, I guess. - pitdog, on 04/29/2009, -0/+6I love it when they first zoom into the Orion. My favorite constellation.
- sindex, on 04/29/2009, -0/+6"Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark. In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves.
The Earth is the only world known so far to harbor life. There is nowhere else, at least in the near future, to which our species could migrate. Visit, yes. Settle, not yet. Like it or not, for the moment the Earth is where we make our stand.
It has been said that astronomy is a humbling and character-building experience. There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known."
-Carl Sagan. - Irranok, on 04/29/2009, -0/+5That's right you cling to your flying spaghetti monster.
- thanakar, on 04/29/2009, -1/+6"Is space expanding faster than the speed of light?"
Yes - rcguy69, on 04/29/2009, -1/+6I would argue that the famous Earthrise photo of our blue planet was the most important image ever taken. It united humanity in making us realize how small, precious and fragile our planet is. The hubble deep field photo arouses no such feelings of brotherhood. In fact, it makes me feel like our survival is a moot point.
- jjiimmyyt, on 04/29/2009, -0/+5As space expands all if it does. Its not like a balloon skin expanding as you blow air into it. If a cubic meter of space from 10 billion years was measured now it would be considerably bigger.
Better explanation here http://www4.ncsu.edu/unity/lockers/users/f/felder/ ... - souljaboytellem, on 04/29/2009, -1/+6I love how you claim they are stupid for not believing in something that has ABSOLUTELY no proof, and involves an invisible man and his son. Clearly, they are the stupid ones
- thanakar, on 04/29/2009, -0/+5Don't forget your towel.
- insanebrain, on 04/29/2009, -0/+4Nobody is trying disprove the existence of a god... it are always the stupid religious people who don't know what they are talking about who are claiming it.
- ASSASSYN360, on 04/29/2009, -3/+7Space, the final frontier. These are the voyages of the Digg.com. Its five-year mission: to explore strange new worlds; to seek out new life and new civilizations; to boldly go where no website has gone before.
- supisumed, on 04/29/2009, -0/+4Putting all the arguments aside, this video/image is so damn cool.
- Velenne, on 04/29/2009, -0/+4"Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there-on a mote of dust suspended in a sunbeam." ~Carl Sagan, http://en.wikiquote.org/wiki/Carl_Sagan
- takamalak, on 04/29/2009, -0/+3http://en.wikipedia.org/wiki/Cosmic_inflation
- inactive, on 04/29/2009, -0/+3Damn. How far back will $787 billion take you?
- hauntedchippy, on 04/29/2009, -0/+3Google co-moving distance.
- inactive, on 04/29/2009, -0/+3Time is relative, thus time is immeasurable.
- patburke1980, on 04/29/2009, -0/+2Carl Sagan could not have been more awesome.
- lazlonger, on 04/29/2009, -0/+2Maybe what is important about the Hubble image is precisely that. We are small, and looking at ourselves from the next rock over, while awesome and important, is still a back turned to the real bigness out there. Coming to terms with that is essential...eventually.
- thanakar, on 04/29/2009, -1/+3You are only insignificant if you fell insignificant. Significance is a relative factor.
- patburke1980, on 04/29/2009, -1/+3you sir just blew my mind.
- raza7370, on 04/29/2009, -1/+3nice story
- GiggleStick, on 04/29/2009, -0/+2I think I heard that before. Or have I yet to hear it? No telling.
- jshhmr, on 04/29/2009, -0/+2Dugg for the Pink Floyd soundtrack!
- pw378, on 04/29/2009, -0/+2No, space is not expanding at faster than the speed of light.... today...
But, in the first second after the big bang it supposedly did. According to theory, it expanded to about 20% of its current size almost instantly (it expanded to 1x10^50 of its size in less than a trillionth of a second). This is called inflation, which is used to explain why the size of the current universe is dramatically larger and more uniformly distributed than it should be, given the age of the universe and the speed of light. Without inflation, and a constant speed of light, the universe should have a diameter of about 28billion light years.
Without inflation theory, everything we see in the Deep Field and other images would mean our understanding of the universe is horribly flawed and broken. - pw378, on 04/29/2009, -0/+2no, we don't think it is infinite... Its closed, not infinite.
- PhoenixAvatar2, on 04/29/2009, -2/+4*we think the universe is infinite. We have no idea if it actually is.
- Quabbe, on 04/30/2009, -0/+1While it is true that no one truly knows what is out there, the point is that we make observations and create theories and models based on those observations. As further evidence presents itself, we refine these theories and models to more adequately fit the data.
This is science at its most basic, with an expert in a field of science knowing more about the observations and the reasoning behind proclamations than you do. Also the idea of peer review, that is that other "experts" try and poke holes in other "experts" theories. This is why we trust their deductions, as a whole - not the individual.
I thought this would be obvious to anyone.... anyone who isn't involved in religion, that is. - Quabbe, on 04/30/2009, -0/+1Yes.
A lot.
Read more physics texts.
That is all. - ClarkBender, on 04/29/2009, -1/+2I agree that Jimmy is awesome.
- uptwolait, on 04/29/2009, -1/+225 pages!? Who on Digg has that kind of attention span?
- pitdog, on 04/29/2009, -0/+1In other news: http://digg.com/space/Colossal_spy_airships_with_1 ...
still more money for looking down... - linksus, on 04/29/2009, -1/+2My idea of whats going on.
http://i43.tinypic.com/s3j7rs.jpg - thcobbs, on 04/29/2009, -1/+2Just skip to the 5:30 mark.... the rest of the video (especially random dude singing) is useless... and generally over dramatic.
- jcgreenx, on 04/29/2009, -1/+2Jimmy is really awesome.
- jshhmr, on 04/29/2009, -0/+1Here's my little space video
http://www.youtube.com/watch?v=Gbv_gH5ybc0 - aaabbbsss, on 04/29/2009, -0/+1Why in the hell was numa numa in there?
- jcgreenx, on 04/29/2009, -0/+1This is awesome!
- zaferk, on 04/29/2009, -0/+1To boldy go where no digger has gone before: a bedroom with a girl.
-
Show 51 - 62 of 62 discussions
© Digg Inc. 2009
— Content created and posted by Digg users is 