Aussie student finds universe's 'missing mass'

By abe10tiger
May 29, 2011
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  1. Archean

    Archean TechSpot Paladin Posts: 5,682   +86

    By the way a week or so ago there was a scientific paper describing the existence of Dark Energy which constitutes 74% of the mass, and this has been confirmed after long experiments as well. Good time for astro physicists I guess ;)
  2. Leeky

    Leeky TS Evangelist Posts: 3,797   +116

    "During her summer break"........... Einstein eat your sodding heart out! Wish I was that sodding genius during my "breaks" :haha:
  3. Benny26

    Benny26 TechSpot Paladin Posts: 1,533   +48

    There has never been any confirmed capture of 'Dark Matter' (or Dark Energy) though, i think i'm right in saying?

    I know they've got sites round the world that are deep down underground looking for it.
  4. Archean

    Archean TechSpot Paladin Posts: 5,682   +86

  5. Benny26

    Benny26 TechSpot Paladin Posts: 1,533   +48

    I know that one of the first arguments was the occolation of galaxys and how stars on the outer rim keep the same speed of the inner ones.

    It is quite the oxymoron to say that it has been observed yet...

    Which is almost like saying "To observe something does not necessarily prove its existence".
  6. Archean

    Archean TechSpot Paladin Posts: 5,682   +86

    I am not sure about the speed being same for outer rim stars as other stars. But as far as I know, their speed dictates the feeding behavior of the blackholes at the center of galaxies, i.e. the faster they are the more the blackhole needs to feed to push away everything else around it.

    Anyway, if we use your logic, same applies to blackholes, we can't see them, but by 'observing' the behavior of stars at the center of the galaxies, we know they are there.
  7. Benny26

    Benny26 TechSpot Paladin Posts: 1,533   +48

    Maybe the overall speed of a galaxy or indeed the overall mass, i'de agree, but as i read up abit here, blackholes and their gravitational impact cannot account for the unusual high velocitys of stars closer to the outer rim of galaxys (insert the Dark Matter theory).

    I remember a TV show not long back about physics where physicists were asked "have you ever seen a blackhole?"....It turned out to be quite a confusing and amusing question for them.
  8. Archean

    Archean TechSpot Paladin Posts: 5,682   +86

    I'll have to dig a bit to comment on 1st part of your reply, so that will come later.

    But second part about seeing blackhole, Einstein predicted that 'halo' of a blackhole could be seen, and astrophysicists have been trying to see the same for many years.
  9. Benny26

    Benny26 TechSpot Paladin Posts: 1,533   +48

    No probs bud...Physics and the cosmos are my favorite topics.

    I presume the 'halo' you're talking about is the 'Event Horizon' (the point at which nothing, not even light, can escape a blackhole). I think at the moment are scopes just arnt powerfull enough to easily make them out, or the fact that these 'horizons' can be very faint and the closest blackhole to us is just abit too far to get a good look.
  10. superty12

    superty12 TS Enthusiast Posts: 413

    Which is a good thing.
  11. Archean

    Archean TechSpot Paladin Posts: 5,682   +86

    General Relativity predicts, that a blackhole will not only create a dark shadow in space, but this shadow will be surrounded by a bright halo. The immense gravity of blackhole warps space around it, focusing star light coming from its behind into a ring. And this Einstein says can be seen, Prof. Shep Doeleman, at MIT with his team is actually working on this thing.

    It took some digging as I couldn't remember the name of Prof. but I guess it is time well spent ;)
  12. Benny26

    Benny26 TechSpot Paladin Posts: 1,533   +48

    Indeed time well spent :)

    Ah i see what you're referring to here; the "Einstein Ring" as it's known, caused by the gravitational lensing effect of a black hole. The phenomenon was first mentioned in 1924 by the St. Petersburg physicist Orest Chwolson, and quantified by Albert Einstein in 1936.

    Apparently quite a few have been observed, most by accident. The Very Large Array (V.L.A) telescope, in New Mexico, is known for most of these observations.

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