Picture A Billion Stars - And What Else?

by Horny Devil Banned
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We will soon be able to take a walk through our Milky Way galaxy. Countless comets, asteroids and planets, that we were previously unaware of will be found. "Gaia", a £620m satellite, was launched this morning from French Guiana, and will enable us to know what and where everything is in our galaxy for the very first time. What will we find?

Gaia 'billion star surveyor' lifts off

http://www.gaia.ac.uk/
  • Profile picture of the author znan
    Originally Posted by Horny Devil View Post

    and will enable us to know what and where everything is in our galaxy
    I doubt that... but I'm curious to know what the satellite will find out :p
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    • Profile picture of the author Horny Devil
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      Originally Posted by znan View Post

      I doubt that... but I'm curious to know what the satellite will find out
      It's quoted from the article, by a professor from a top university. Maybe you know something he doesn't.
      I doubt that.
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      • Profile picture of the author Claude Whitacre
        I understand the methods used. Very interesting. I can't wait to see what they find.
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      • Profile picture of the author znan
        Originally Posted by Horny Devil View Post

        It's quoted from the article, wrote by a professor from a top university. Maybe you know something he doesn't. I doubt THAT.
        Horny Devil, I read the article and I'm sure they do know what they are talking about and a lot more than I do, for sure.

        If you look at my previous post, I took your phrase out of context, i didn't quote your entire post. I was just imagining in my head a satellite that could know what and where everything is on the galaxy, like my car keys or my missing socks. That would save me a lot of time. :p That's why I said "I doubt that", so you see, it was just a little joke inside my head.

        Please forgive me.
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      • Profile picture of the author alistair
        Originally Posted by Horny Devil View Post

        It's quoted from the article, by a professor from a top university. Maybe you know something he doesn't.
        I doubt that.
        Never seen Good Will Hunting I surmise.
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  • Profile picture of the author HeySal
    Is this a shoot-off of the first Gaia satellite? They pointed that back at earth some years, possibly decades now, and found that the earth itself is "alive". Wonder if they'd find the same thing now we've practically destroyed the whole place.
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  • Profile picture of the author Dennis Gaskill
    This is awesome! I can't want for the data to start rolling in. A one billion pixel camera, wowzers.

    On the other hand...
    There are roughly 100 thousand million (100,000,000,000) stars in the Milky Way.
    Why don't they just say 100 billion?
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    • Profile picture of the author Frank Donovan
      This is soooo cool. The "time lapse movie" produced from this technology reportedly can be run forwards to see the future, and run backwards to see a depiction of how our galaxy was assembled. And this just 400 years or so since Galileo first pointed his rudimentary telescope at the heavens.

      We're living in charmed times.

      Originally Posted by Dennis Gaskill View Post

      Why don't they just say 100 billion?
      Dennis, it's a UK site. They're probably just feeling nostalgic for the time (not that long ago) when a billion meant a million million - until the US version (1,000 million) took over the world, and soon no doubt, the galaxy.



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    • Profile picture of the author Claude Whitacre
      Originally Posted by Dennis Gaskill View Post

      This is awesome! I can't want for the data to start rolling in. A one billion pixel camera, wowzers.

      On the other hand...

      Why don't they just say 100 billion?
      No idea. But there are also about 50 Billion galaxies. 100 billion Suns, times 50 billion galaxies.

      It's a big universe.
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      • Profile picture of the author Dennis Gaskill
        Originally Posted by Claude Whitacre View Post

        No idea. But there are also about 50 Billion galaxies. 100 billion Suns, times 50 billion galaxies.

        It's a big universe.
        I've seen estimates as high as 500 billion galaxies and 1 septillion stars (that's a 1 followed by 24 zeros). But let's face it, no one knows, really. They're all rough estimates, and still only the observable universe.

        And as big as it is, it fits neatly inside a small nook in my mind.
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        • Profile picture of the author lanfear63
          Originally Posted by Dennis Gaskill View Post

          I've seen estimates as high as 500 billion galaxies and 1 septillion stars (that's a 1 followed by 24 zeros). But let's face it, no one knows, really. They're all rough estimates, and still only the observable universe.

          And as big as it is, it fits neatly inside a small nook in my mind.
          And that's in our universe alone alledgedly. A Horizon program a few years back said that (quoting the latest theories, no real proof) that there are possibly multipule universes, all ball shaped due to uniform expansion in all directions and each had a thin outer membrane. All floating in an infinite sea of infinite space. Infinite universes. When one bumped into another, the release of energy would cause a big bang, thus causing a new one to appear.

          Cosmic billiards. To top that because of the infinite universes there would be near exact duplicates of our world and even us. It also said there were 11 dimensions to contend with too.

          That means there are infinite 7 of 9 Geri Ryans out there, some of which may not be married and attacted to British accents!
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        • Profile picture of the author Claude Whitacre
          Originally Posted by Dennis Gaskill View Post

          I've seen estimates as high as 500 billion galaxies and 1 septillion stars (that's a 1 followed by 24 zeros). But let's face it, no one knows, really. They're all rough estimates, and still only the observable universe.

          And as big as it is, it fits neatly inside a small nook in my mind.
          They are rough estimates, but nearly everything I read keeps our Galaxy at between 50-100 billion stars...and maybe 50 billion galaxies. Of course, those estimates are based on small samples of space....and we can't see everything.

          To be honest, for most of us those figures are too big to be meaningfull anyway.
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          • Profile picture of the author MissTerraK
            I find this completely awe inspiring! I'd love to see the footage when it's available. I bet it will be awesomely mind blowing!

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          • Profile picture of the author Dennis Gaskill
            Originally Posted by Claude Whitacre View Post

            They are rough estimates, but nearly everything I read keeps our Galaxy at between 50-100 billion stars...and maybe 50 billion galaxies. Of course, those estimates are based on small samples of space....and we can't see everything.

            To be honest, for most of us those figures are too big to be meaningfull anyway.
            Old theories die hard. I wasn't challenging your figures, by the way. Just wanted to bring out the other side of the estimates.

            I don't think I've ever seen estimates as low as 50 billion. 100 billion or 200 billion seem to be the most often cited figures. It should be interesting to see how this new satellite will change the estimates.

            Too big to be meaningful? Bigger is better...


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            • Profile picture of the author Claude Whitacre
              [QUOTE=Dennis Gaskill;8802969]Old theories die hard. I wasn't challenging your figures, by the way. Just wanted to bring out the other side of the estimates.

              I don't think I've ever seen estimates as low as 50 billion. 100 billion or 200 billion seem to be the most often cited figures. It should be interesting to see how this new satellite will change the estimates.

              Too big to be meaningful? Bigger is better...


              Dennis; I should think that you would NOT question my figures. Harrummph!

              Actually, I think you're right. I keep getting the stars in the galaxy/number of galaxies figures reversed. I think it's 200 billion stars and 50 billion galaxies. Not including foreign galaxies under communist rule.

              Heck, 50 years ago, we didn't even know there were other galaxies.

              And bigger is not always better. At least I keep telling myself that. :rolleyes::rolleyes::rolleyes:
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              • Profile picture of the author Dennis Gaskill
                Originally Posted by Claude Whitacre View Post

                And bigger is not always better. At least I keep telling myself that. :rolleyes::rolleyes::rolleyes:
                If you're talking about what I think you're talking about...

                You have my sympathies!
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              • Profile picture of the author HeySal
                [quote=Claude Whitacre;8803013]
                Originally Posted by Dennis Gaskill View Post

                Old theories die hard. I wasn't challenging your figures, by the way. Just wanted to bring out the other side of the estimates.

                I don't think I've ever seen estimates as low as 50 billion. 100 billion or 200 billion seem to be the most often cited figures. It should be interesting to see how this new satellite will change the estimates.

                Too big to be meaningful? Bigger is better...


                Dennis; I should think that you would NOT question my figures. Harrummph!

                Actually, I think you're right. I keep getting the stars in the galaxy/number of galaxies figures reversed. I think it's 200 billion stars and 50 billion galaxies. Not including foreign galaxies under communist rule.

                Heck, 50 years ago, we didn't even know there were other galaxies.

                And bigger is not always better. At least I keep telling myself that. :rolleyes::rolleyes::rolleyes:
                I got interested in astronomy at the age of 6 - and they knew there were galaxies then. About 6 years later we were on the moon. We were more scientifically advanced early in the 1900's than you realize.

                By definition then, to my way of thinking there can't be multiple universes. If the universe is "everything" there can't be another "everything." They must be using their own definition of "universe" if they say there is more than one.
                I think you're getting hooked into an idea semantically. "universe" is just a word we made to describe what was everything in range of our existence in the third dimension. If we were to find the actual barrier, wall, curtain, or whatever separates one universe from the next, the denotation of the word would naturally split to encompass the new discovery. Our minds can be limited by language the same way our view of our universe is limited by our telescopes. Since we are moving through this one at absolutely break-neck speeds, we can only hope there's not a solid wall between universes. That could get very messy.
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                • Profile picture of the author Dennis Gaskill
                  Originally Posted by HeySal View Post


                  I got interested in astronomy at the age of 6 - and they knew there were galaxies then. About 6 years later we were on the moon. We were more scientifically advanced early in the 1900's than you realize.
                  FWIW ... When Claude quoted me it didn't quote correctly, so when you quoted him it looks like you're replying to me, but I'm not the one who said what you're replying too.

                  I think you're getting hooked into an idea semantically. "universe" is just a word we made to describe what was everything in range of our existence in the third dimension. If we were to find the actual barrier, wall, curtain, or whatever separates one universe from the next, the denotation of the word would naturally split to encompass the new discovery. Our minds can be limited by language the same way our view of our universe is limited by our telescopes. Since we are moving through this one at absolutely break-neck speeds, we can only hope there's not a solid wall between universes. That could get very messy.
                  Well, yes, I'm using the dictionary definition...
                  noun: everything that exists anywhere
                  ...and I'm going to be stubborn on this one. If they want something that doesn't encompass everything in existence they need a new word. You can't have two things that each hold everything in existence.

                  And Pluto is still planet in my world. It should have been grandfathered in. :p
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                  • Profile picture of the author HeySal
                    Originally Posted by Dennis Gaskill View Post

                    FWIW ... When Claude quoted me it didn't quote correctly, so when you quoted him it looks like you're replying to me, but I'm not the one who said what you're replying too.



                    Well, yes, I'm using the dictionary definition...

                    ...and I'm going to be stubborn on this one. If they want something that doesn't encompass everything in existence they need a new word. You can't have two things that each hold everything in existence.

                    And Pluto is still planet in my world. It should have been grandfathered in. :p
                    Well, whoever the quote goes out to -- consider it quoted.

                    All that needs to be done is update a very old version of the word "universe". Definitions are not stagnant. They change over time. I would imagine that it's time to update this one.
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                    • Profile picture of the author Dennis Gaskill
                      Originally Posted by HeySal View Post


                      All that needs to be done is update a very old version of the word "universe". Definitions are not stagnant. They change over time. I would imagine that it's time to update this one.
                      I told you I'm going to be stubborn on this one.

                      If we change the word "universe" so it no longer means everything that exists anywhere, are we also going to make up a new word for what universe used to mean?
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                      • Profile picture of the author Frank Donovan
                        Originally Posted by Dennis Gaskill View Post

                        If they want something that doesn't encompass everything in existence they need a new word. You can't have two things that each hold everything in existence.
                        Originally Posted by HeySal View Post

                        All that needs to be done is update a very old version of the word "universe". Definitions are not stagnant. They change over time. I would imagine that it's time to update this one.
                        Well, there is a word: multiverse which is sometimes used when discussing multiple universes, but the problem is that the notion of more than one universe is still hypothetical, which makes any new definition a little tricky to pull off. Factor in the concept of multiple dimensions which questions traditional ideas of existence - the nature of stuff - and it's almost impossible to arrive at a standard definition that satisfies everyone.

                        No doubt there's more of that pesky quantum theory behind all this...


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                        • Profile picture of the author Dennis Gaskill
                          Originally Posted by Frank Donovan View Post

                          Well, there is a word: multiverse which is sometimes used when discussing multiple universes, but the problem is that the notion of more than one universe is still hypothetical, which makes any new definition a little tricky to pull off. Factor in the concept of multiple dimensions which questions traditional ideas of existence - the nature of stuff - and it's almost impossible to arrive at a standard definition that satisfies everyone.

                          No doubt there's more of that pesky quantum theory behind all this...


                          Frank
                          I know Frank, I'm just having fun.

                          The idea of multiverses and parallel universes existing are interesting and fun to talk about. I had a dream once where I was being taught the nature of reality, and for a few seconds I was able to see another dimension that co-existed with ours, occupying the same space and time. It was an awesome dream.
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                          • Profile picture of the author Frank Donovan
                            Originally Posted by Dennis Gaskill View Post

                            I had a dream once where I was being taught the nature of reality, and for a few seconds I was able to see another dimension that co-existed with ours, occupying the same space and time. It was an awesome dream.
                            I envy you Dennis. Any dreams I have tend to be about my local football team winning a match. Yours sound much more realistic.
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                            • Profile picture of the author Horny Devil
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                              Multiple universes, parallel, universes, and most of the aforementioned aside, we will have a much better understanding of the order of things in the cosmos when the results of the Gaia mission into our own galaxy are complete . . . and the subsequent mind-boggling amount of data is released, analysed and dissected, by the relevant boffins.

                              I believe we are on the cusp of truly great discovery and wish my years on this tiny speck we call Earth, in the vastness of space, could be greatly extended. How wonderful it would be to witness further instalments in this epic wonderland of astronomical discoveries that will unfold for future generations.

                              There's nothing, absolutely nothing, that inspires such awe as what's actually above your head. That is, unless it's the wife using her expert overarm swipe above your head with the frying pan, when you're late back from the bar.
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                          • Profile picture of the author MikeTucker
                            Originally Posted by Dennis Gaskill View Post

                            I had a dream once where I was being taught the nature of reality, and for a few seconds I was able to see another dimension that co-existed with ours, occupying the same space and time. It was an awesome dream.
                            I had a dream where I was randomly chosen to be transported to our
                            home planet-- more than 90% of life on Earth is actually alien, brought
                            here by us (also alien).

                            The space travel was the most interesting part, somehow I was
                            transported at a speed beyond my comprehension, using something
                            about some yet undiscovered fields around stars. (sorry for the
                            vagueness, but apparently our technology is much better than ours? :confused: )

                            Anyway, they used most of their energy for such transport to
                            show me the Universe and have me come back and tell everyone,
                            along with an incredible secret that will either save or damn all
                            life in the Universe if we don't start working on the problem immediately
                            upon my return.

                            I tried to explain that nobody is going to believe me, and that
                            I would probably get myself locked-up in a loony bin. I pictured
                            my future as one of those homeless people in the snow, ignoring
                            their world and trying desperately to get people to listen to the
                            fact that the world is coming to an end if everyone doesn't start
                            doing something about it NOW, and the aliens (that are us)
                            transported me to the other side of the Universe so that I
                            could bring the message back.

                            They wouldn't listen. I was the only hope, the last ditch effort,
                            and I HAD to do it. All life in the Universe depended on me
                            coming back and sharing this secret with everyone.

                            Being transported back quadrants at a time, then galaxies, then
                            stars... There are no words in any language to describe the
                            way it made me feel. "Rapturous ecstasy" is a disgusting insult,
                            then even that emotion pales and dies away.

                            Unfortunately, I was so distracted by it all that I forgot what we were
                            supposed to do to save all life in the Universe? Sorry guys.
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                            • Profile picture of the author Dennis Gaskill
                              Originally Posted by MikeTucker View Post

                              I had a dream where ... Unfortunately, I was so distracted by it all that I forgot what we were
                              supposed to do to save all life in the Universe? Sorry guys.
                              Oh sure, we're all doomed because you have a forgetful spell. Well thanks a lot Mike, thanks a lot.



                              (Sounds like a cool dream though.)
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                • Profile picture of the author Claude Whitacre
                  Originally Posted by HeySal View Post


                  I got interested in astronomy at the age of 6 - and they knew there were galaxies then. About 6 years later we were on the moon. We were more scientifically advanced early in the 1900's than you realize.
                  In 1923 Edwin Hubble figured out that the Andromeda Galaxy was a separate galaxy from ours. He thought it was a nebulae at first.

                  But the Hubble telescope only showed us photos of distant galaxies much later. You are right.
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  • Profile picture of the author MikeTucker
    I love this kind of stuff. It's awe-inspiring.

    Of course, I posted it to Facebook and certain types of people
    came along and talked about how small and insignificant humans
    are in the grand scale of the Universe, blah blah blah

    These are the same people that watch the "EPIC FAIL" videos
    instead of the "EPIC WIN" compilations.

    100 thousand million, 100 billion, 1,000 million, 100 billion x 50 billion,
    I don't know... In reality, most astronomical numbers are beyond
    my ability to actually imagine and comprehend. But they don't make
    me feel small-- on the contrary, it just feels like the potential for
    limitless human greatness-- It's a big Universe indeed, a massive playground
    for us to discover and explore.

    I think about the knowledge of people a couple of thousand years ago,
    or even a hundred years ago, and even 10 years ago-- compared to what
    we know now, the corrections we have made in our own knowledge,
    our new discoveries...

    I wish I could imagine what life will be like for people 2,000 years from
    now, and what it will be like when we first physically explore beyond our
    Solar System, through the galaxy... Beyond our galaxy.

    Nope, I'm not stoned. My head is spinning, though, haha
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  • Profile picture of the author Dennis Gaskill
    And that's in our universe alone alledgedly. A Horizon program a few years back said that (quoting the latest theories, no real proof) that there are possibly multipule universes...
    Yeah, I don't get that. The universe is defined as "all existing matter and space considered as a whole; the cosmos."

    By definition then, to my way of thinking there can't be multiple universes. If the universe is "everything" there can't be another "everything." They must be using their own definition of "universe" if they say there is more than one.
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  • Profile picture of the author MikeTucker
    Yeah, too much Arthur C. Clarke maybe?

    An Inter-dimensional dream is so much cooler, though!
    Being taught the nature of reality?!

    Maybe I'll start reading Flatland with a glass of wine every night, haha...
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