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Dark Matter 3D Map



Uploaded by: rshida
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COSMOS Video News Release
For the first time ever, astronomers have been creating a three
—dimensional map of how the dark matter is distributed across the Universe. An international team of scientists, among them groups from Marseille, the Max-Planck Institutes and Paris have been using data from the NASA/ESA Hubble Space Telescope. The results are published in nature online of 8 Janu
ary 2007, and at the meeting of the American Astronomical Society in Seattle. This Video News Release discussed this discovery. More on: http://www.spacetelescope.org/news/html/heic0701.html


Tags for this video: astronomy dark galaxies hubble hubblecast matter sky space stars telescope

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One of the reasons ... ( 5 months ago by bickleynet)
One of the reasons they believe dark matter exists is because the rate at which some galaxy's are spinning the centrifugal force would cause some stars and planets to be flung out into space but what if there is a black hole at the centre of most universes (because of the gravity of the universe) causing a gravitational pull holding the planets and stars in orbit? Continued...
How much of the ... ( 5 months ago by thatguy431)
How much of the universe is supposedly made of dark matter? Ive heard/read anywhere from 60% to even 99%.....that in itself seems like quite a bit of error, and to me, seems to lose is plausibility...but thats just me
XD hhahaaha ( 5 months ago by thatguy431)
XD hhahaaha
Not that much.. ... ( 4 months ago by espedos)
Not that much.. Ordinary baryonic particles (like protons, neutrons) account for only one-sixth of the TOTAL matter in the Universe. The remainder (5/6) is a mysterious "dark matter" component, which does not interact via electromagnetism and thus neither emits nor reflects light.
I recieved a ... ( 4 months ago by FIGGYXfiggy)
I recieved a presentation on dark matter by the PI, and apparantley the current theory to the existence of dark matter comes to two conclusions: dark matter is made up of particles known as WIMPs or AXIONs. these particles by nature are smaller than electrons but weigh more than protons. These small particles (if they exist) pass through everything every day without affecting anything. therory #2 is that the theory of universal gravitation is wrong. But this is just a theory in working progres
Im not really sure ... ( 4 months ago by FIGGYXfiggy)
Im not really sure on what percentage of the universe accounts for dark matter but i do know that about 90% of most galaxies are made up of dark matter to answer your question
To answer your ... ( 4 months ago by dph79)
To answer your point, the universe is about 73% dark energy, 23% dark matter and 4% normal matter. The amount of dark matter varies somewhat between galaxies.
Just another point, AXIONs are just one type of WIMP (weakly interacting massive particle). Other examples are neutrinos, and the hypothetical magnetic monopole.
they say in the ... ( 4 months ago by flc735)
they say in the beginning dark matter doesn't emit or reflect light. can you say the same about crystal clear glass (for example) or is that totally different?
Why would dark ... ( 3 months ago by featheredmusic)
Why would dark matter distort light? Would that mean it has gravitational pull?
i dont understand ... ( 3 months ago by lavender06)
i dont understand this? could someone explain it to me again?
maybe the ... ( 3 months ago by flavour009)
maybe the distortion of light is cause by some property that is similar to crystals or water, i dont know, just guessing. but yeh, does dark matter have a gravitational pull.
what's the ... ( 3 months ago by suril22)
what's the difference between dark matter and dark energy? A reply would be greatly appreciated.
Dark Matter is ... ( 3 months ago by schmitz9066)
Dark Matter is material that helps keep the galaxy gravitationally bound. Dark energy helps accelerate the expansion of the universe by increasing the distances between the superclusters on a larger scale.
good explaination.. ... ( 3 months ago by suril22)
good explaination...thank you!
the main thing is ... ( 3 months ago by flc735)
the main thing is dark is code name for unknown. dark matter is matter that we don't know what it is (because we can't see it). and dark energy is energy that we can't observe. dark matter (just like matter) has a gravatational force and gravity does effect light (just very very slightly).
You just answered a ... ( 2 months ago by XtremeDrainer)
You just answered a homework assignment for me@ THX!
i kind of had a ... ( 1 month ago by mrwright1526)
i kind of had a similair idea. Space is a wetless liquid
Yes, gravity is the ... ( 1 month ago by Saerain)
Yes, gravity is the only reason we know something exists in those areas. Since we can't see what is exerting that gravity, we call it 'dark matter'.
and people say ... ( 3 weeks ago by forakiller)
and people say theres no creator
ohh i would say ... ( 1 week ago by ododidit)
ohh i would say this existence is very much intentional and has been created by a race of creatures outside what we can comprehend within our limited 3/4 dimentional awareness, however what the end result is or the purpose will elude us forever.
The reason a theory ... ( 1 week ago by Impossiboss)
The reason a theory for dark matter was brought up is because there was more gravitational force in the universe than the matter that exists could produce. The matter we can observe only creates 1/4th of it. And the reason we cant go get handfuls of dark matter in space is because it isn't dense at all. But because there are such vast distances its lack of density is made up by the amount of space it occupies.
(First Comment, followed by a second.)
But two things I ... ( 1 week ago by Impossiboss)
But two things I thought of.
I havn't thought this one out so it probobly has a fundamental flaw I'm not considering : What is things are just 3/4ths heavier than we thought? The other being : What if the extra gravity comes from black holes? We can't tell exactly what a black hole is made up of and we don't know they they h
ave a definite level of density or what that level of density is. (Second comment, followed by a third.) (I just thought of something else haha.)
In between 0 and 1 ... ( 1 week ago by Impossiboss)
In between 0 and 1 there is an infinite amount of numbers.
0.12 0.112 0.1112 0.11112 It goes on forever. So does matter have a maximum density? A point in which it is so dense it can no longer be compacted? If matter is made of things with a definite mass that cant be lessened then yes. But since all things are relative to math, and math states that it g
oes on forever. Could matter not be compacted forever? Even the smallest quarks being pushed infinitely smaller than their origninal size?
Thanks, yeah I've ... ( 3 days ago by Impossiboss)
Thanks, yeah I've never read any papers so I really lack on knowing the principles and theories. I try to do it all through speculation.



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