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Distant Universe

Discussion in 'Science & Technology' started by Drone, May 6, 2012.

  1. Drone

    Drone

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    Using the Subaru Telescope, a team of Japanese astronomers has discovered the most distant protocluster of galaxies ever found - one that existed less than one billion years after the Big Bang. The astronomers were able to directly observe this cluster of galaxies at an early stage in galaxy evolution, when structures were beginning to form in the early Universe. This discovery will be an important step on the way to understanding structure formation and galaxy evolution.

    [​IMG]

    Objects circled in red are galaxies 12.7 billion light-years away.

    Awesome news. Such structures are very faint and rare. This structure is less than 1 billion years younger than Big Bang.

    http://phys.org/news/2012-05-subaru-telescope-distant-protocluster-galaxies.html
    Naito, AphexDreamer, Ahhzz and 3 others say thanks.
  2. Drone

    Drone

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    Bump

    Another really distant and faint object!

    See the green source near the center of the image cutout.

    [​IMG]

    Well done.

    This is indeed a very tough and difficult task

    http://phys.org/news/2012-06-asu-astronomers-faintest-distant-galaxy.html
    Last edited: Jun 2, 2012
    Inceptor says thanks.
  3. Inceptor

    Inceptor

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    It's nice to see that astronomers are finally getting more data from the edge of our 'visual' horizon.
    It always makes me wonder if anything interesting is now going on beyond our horizon, in the now tens of billions of light years of extra space that has opened up since the time, 13 billion years ago, when this light from this galaxy started its journey to us, here.
  4. Drone

    Drone

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    Now ALMA (Atacama Large Millimeter/submillimeter Array) reveals constituent of a galaxy at 12.4 billion light-years away. ALMA observes celestial objects at submillimeter wavelength, which penetrates through dust clouds (which block visible light). :cool:

    That's cool.

    http://phys.org/news/2012-06-alma-reveals-constituent-galaxy-billion.html
  5. hat

    hat Maximum Overclocker

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    The way I always thought it worked was that empty space is infinite, and the expanding space is objects drifting further apart from each other.
    Crunching for Team TPU
  6. D007

    D007

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    Cool stuff, they are really getting out there now a days..
    But there is one thing we still cannot escape in regards to the visible universe.. Our universal constant, the speed of light.. We can't see any further, because light hasn't gone any further.. No idea how big the universe really is.. It's like having a solid black balloon, inside a balloon. You can't know how big the outer balloon is, because you can't see it.
  7. Pioneer.twelve New Member

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    What I would do to be able to travel amongst the stars...
  8. D007

    D007

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    Just jump... Really hard...
    You have to believe... :roll:
  9. Drone

    Drone

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    There's no such thing as <empty> space. Space itself is already something.

    Intergalactic travel would be amazing. If human race wants to survive sooner or later they have to find a way to make it possible. Without superluminal motion (which most likely don't even exist) that'd be really hard. Maybe there are shortcuts through some hyper-dimensions, that would make everything easier.
  10. W1zzard

    W1zzard Administrator Staff Member

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    current data suggests that the universe is flat, there is a certain amount of measuring error, which could mean that the universe is just really really big, so the local curvature we see is too small to detect it (like the earth looks flat to you).

    expanding universe means the space _between_ galaxies expands. objects that are gravitationally bound like our whole galaxy, the atoms of the earth, the atoms in your body, their electrons, do not move apart from each other.

    a popular example to illustrate expanding universe is a balloon with dots painted on it (galaxies), and the balloon gets inflated, so the space between all points expands. a more accurate representation would be to glue some colored paper dots on it (so those won't expand)
  11. Completely Bonkers New Member

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    God made the universe a Möbius strip just to fuck with us.
  12. Drone

    Drone

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    There's a lot of other stuff which is more mind-fucking than Mobius strip lol. Hypertorus for example ...

    [​IMG]
    m1dg3t says thanks.
  13. Ahhzz

    Ahhzz

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    Personally, I think someone glued glitter to the lens on the 'scope.....
  14. Drone

    Drone

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    Lol yes it looks like that. It's amazing that light from so many stars and galaxies had made such a long way through space and time to reach us. A lot of things changed since that time, many new galaxy clusters have formed and they all create gravitational lensing to distort and to increase that distant light. Here's more news:

    [​IMG]

    It's no wonder the image is so fuzzy and distorted, it's so darn far away.

    What an amazing discovery!

    http://phys.org/news/2012-06-rare-case-gravitational-lensing.html

  15. bostonbuddy New Member

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    so these would be first generation stars?
  16. de.das.dude

    de.das.dude Pro Indian Modder

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    so if we just had 13.7 billion light years away, we could ave seen the big bang?
  17. RejZoR

    RejZoR

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    Theoretically, this could mean that if there are any intelligent creatures, they are probably on these distant galaxies since they were formed looooong before our galaxy did. Plenty of time to evolve.
    Hell, it is even possible that there were civilizations that are already gone before even humans started walking the Earth. Who knows.
  18. Drone

    Drone

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    Interesting question. Maybe the Big Bang can be seen from those distant clusters. In that case those alien astronomers indeed have more information than we can ever imagine.
  19. W1zzard

    W1zzard Administrator Staff Member

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    until about 300,000 years after the big bang, the whole universe was filled with plasma.
    plasma is opaque to electromagnetic radiation = light can not travel through it

    [​IMG]
    the cosmic microwave background that we see today is the first light that could move freely through the universe, and has reached us just now. due to the expansion of the universe its wavelength has been shifted down to microwave frequencies.

    in theory it could be possible to observe something earlier using neutrinos, for which plasma is transparent. but it's incredibly hard to record neutrinos.

    ---

    the aliens will "see" a sphere of same size as we do, but with the center around their own planet. the big bang happened everywhere at the same time, so there is no place where you could be, to be closer to it, to observe it any better
    Last edited: Jun 27, 2012
  20. Ahhzz

    Ahhzz

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    Blasphemers!!!! :)
  21. Drone

    Drone

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    And what if aliens managed to achieve superluminal velocity and broke through that "300 000-years-after-the-big-bang" horizon?
  22. W1zzard

    W1zzard Administrator Staff Member

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    i dont think it makes any difference for that. if they can travel ftl, that doesnt make light from the big bang travel faster. it also doesnt change the property of plasma (in the past).

    maybe Q could go back to the beginning of time and change the physical properties of stuff
  23. Drone

    Drone

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    I didn't talk about light. They could travel towards primordial light
    What's q?
  24. W1zzard

    W1zzard Administrator Staff Member

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    http://en.wikipedia.org/wiki/Q_(Star_Trek)

    we are actually moving towards cmb as the original, uncleaned up data from wmap shows:
    http://apod.nasa.gov/apod/ap050508.html

    it doesn't change anything in teh data, its just added red/blue shift. to get to the image i posted earlier, scientists did some math to remove such velocities and make the data like it would be if earth was at rest.

    ---

    if they travelled back in time to observe the early universe at their planet's location their presence there would change the (at that time very) uniform density in that region of space, which could cause a black hole to form a few B years later -> no alien planet

    maybe that's why there is a cold spot:
    [​IMG]
    Last edited: Jun 27, 2012
  25. Drone

    Drone

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    WMAP, yes I remember now. Dark flow I guess. Like they say "the motion may be a remnant of the influence of no-longer-visible regions of the universe prior to inflation".

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