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dark matter!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

it is in space
by

aydan marasco

on 15 September 2013

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Transcript of dark matter!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

so what is dark matter????
DARK MATTER!!!!!!!!!
This is dark matter.
Dark matter is a source of energy that holds the universe together and it creates the gravitational pull.
We can only see 0.01
dark matter out of 0.05 dark matter.


So as you can see there is not much dark matter in the universe.
(1)Massive Standard Model neutrinos. If any of the neutrinos are massive, then this could be the missing mass. On the other hand, if they are too heavy, as the purported 17 keV neutrino would have been, massive neutrinos create almost as many problems as they solve in this regard.
(2)We believe that that the Universe is critically balanced between being open and closed. We derive this fact from the observation of the large scale structure of the Universe. It requires a certain amount of matter to accomplish this result. Call it M.
(3)We can estimate the total baryonic matter of the universe by studying Big Bang nucleosynthesis. This is done by connecting the observed He/H ratio of the Universe today to the amount of baryonic matter present during the early hot phase when most of the helium was produced. Once the temperature of the Universe dropped below the neutron-proton mass difference, neutrons began decaying into protons. If the early baryon density was low, then it was hard for a proton to find a neutron with which to make helium before too many of the neutrons decayed away to account for the amount of helium we see today. So by measuring the He/H ratio today, we can estimate the necessary baryon density shortly after the Big Bang, and, consequently, the total number of baryons today. It turns out that you need about 0.05 M total baryonic matter to account for the known ratio of light isotopes. So only 1/20 of the total mass of the Universe is baryonic matter.
(4)A brief answer would be because the galaxy doesn't act like we think it should. Gravitationally, it acts like there is a lot of mass that we can't see. Not just some stars we can't see, but a LOT of mass that we have absolutely no evidence of. If our theories about gravity are right, there must be some huge amount of massive gravitationally interactive matter spread across the galaxy and universe. Understanding this thing that makes up a majority of the galaxy would be a huge step in our knowledge of the cosmos.
(5)The galaxies in our Universe are not exclusively made up of the stuff we can see, but are held together by the gravitational pull of so-called dark matter. We shouldn't assume that everything is equally obvious and shouldn't therefore be surprised by this discovery.
We got the information from
By yours truly Jacob and Aydan.
http://science.nasa.gov
http://en.wikipedia.org
http://math.ucr.edu
http://plus.maths.org
www.sciencedirect.com
www.nature.com
fact:the word dark matter is another word for the gravitational pull.
NUCLEOSYNTHESIS
Full transcript