26-11-10

Mini-oerknak resulteert in superhete vloeistof (LHC - CERN)

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http://allesoversterrenkunde.nl/nieuws/4274-Mini-oerknak-...

 

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Mini-oerknak resulteert in superhete vloeistof (LHC - CERN)

25 november 2010


allesoversterrenkunde.nl
 

 

IMAGE.jpg

 

copyright - credits


http://www.scienceparkamsterdam.nl/onderzoek/nieuwsberich...

 

Kort na de oerknal was het heelal een extreem dikke, superhete vloeistof.

 

Dat is de verrassende ontdekking die onderzoekers hebben gedaan met de Large Hadron Collider (LHC), de grote deeltjesversneller in Zwitserland.


Op 7 november begonnen wetenschappers een nieuw experiment met de LHC, waarbij zij de kernen van loodatomen met enorme snelheden tegen elkaar lieten botsen.


Bij die botsingen ontstonden kleine vuurballen van subatomaire deeltjes met een temperatuur van meer dan 10 biljoen graden.
 

Het idee achter dit experiment was om de 'oersoep' van deeltjes te reproduceren, het zogeheten quark-gluonenplasma, zoals die een miljoenste seconde na het
ontstaan van het heelal moet hebben bestaan.


Quarks en gluonen zijn de bouwstenen van de neutronen en protonen die de atomen vormen.


Volgens veel modellen die de deeltjesstroom van dit subatomaire vuurwerk beschrijven, zou deze oersoep zich als een gas moeten gedragen.


Maar uit de waarnemingen blijkt nu dat de oersoep, precies zoals de naam al aangeeft, meer weg had van een vloeistof.


Ook de dichtheid van de subatomaire deeltjes die bij de botsingen vrijkwamen, verrast de onderzoekers: bij de 'mini-oerknallen' werden veel meer van die
deeltjes gevormd dan verwacht.


Het is volgende wetenschappers overigens nog te vroeg om uit deze eerste resultaten verregaande conclusies te trekken over de structuur van het jonge heelal.

 

© Eddy Echternach

www.astronieuws.nl

 

copyright-credits

http://allesoversterrenkunde.nl/nieuws/4274-Mini-oerknak-...

 

 

25-11-10

What is Dark Energy ?

by Clara Moskowitz


27th april 2010


Dark energy is the name given to an unexplained force that is drawing galaxies away from each other, against the pull of gravity, at an accelerated pace.

 

Dark energy is a bit like anti-gravity. Where gravity pulls things together at the more local level, dark energy tugs them apart on the grander scale.

 

Dark Matter and Dark Energy.png


Dark Matter and Dark Energy Simplified Structure

 

Its existence isn't proven, but dark energy is many scientists' best guess to explain the confusing observation that the universe's expansion is speeding up.

 

Experts still don't know what's driving this force, but the quest to learn more about dark energy is one of cosmologists' top priorities.


Copyright - credits for article : http://www.space.com/scienceastronomy/090427-mm-dark-ener...


Copyright - credits photo : commons.wikimedia.org

 

URL Photo :

 

http://commons.wikimedia.org/wiki/File:Defining_Darkc_Mat...

22-11-10

Penrose: WMAP Shows Evidence of ‘Activity’ Before Big Bang

22nd November 2010


Have scientists seen evidence of time before the Big Bang, and perhaps a verification of the idea of the cyclical universe?


One of the great physicists of our time, Roger Penrose from the University of Oxford, has published a new paper saying that the circular patterns seen in the WMAP mission data on the Cosmic Microwave Background suggest that space and time perhaps did not originate at the Big Bang but that our universe continually cycles through a series of “aeons,” and we have an eternal, cyclical cosmos.


His paper also refutes the idea of inflation, a widely accepted theory of a period of very rapid expansion immediately following the Big Bang.

 

Sir Roger Penrose.jpg

 

Copyright - Credits : Universe Today

 

http://www.universetoday.com/79750/penrose-wmap-shows-evi... 

 

12-11-10

Hubble Provides Most Detailed Dark Matter Map Yet

 

11th November 2010

 

DarkMatterAbell.jpg

 

Nasa Hubble Space Telescope shows the distribution of dark matter in the center of the giant galaxy cluster Abell 1689. (more than 1000 galaxies with trillions of stars).

 

Credit: NASA, ESA, D. Coe (NASA Jet Propulsion Laboratory/California Institute of Technology,
and Space Telescope Science Institute), N. Benitez (Institute of Astrophysics of Andalusia, Spain), T. Broadhurst (University of the Basque Country, Spain), and H. Ford (Johns Hopkins University).

 

Credits :

 

http://www.universetoday.com/78309/hubble-provides-most-d...

 

11-11-10

Cosmology - animation photo from Big Bang To Present Time

FromBigBangtopresenttime.jpg

10-11-10

Cosmology Video - The Hubble Ultra Deep Field in 3D


 

Animation Credit:

 

Hubble Cosmological Redshift Animation Courtesy:

 

Mike Gallis

 

http://phys23p.sl.psu.edu/phys_anim/Phys_anim.htm

 

http://www.youtube.com/watch?v=e6G2Z6iD-9M

 

Music Used in this video was purchased from stockmusic.net and belongs to the Spirit Legends Collection.

 

The tunes I used were:

 

Voice Redo B

 

Voice in the Dark

 

Link to demos:

 

http://www.stockmusic.net/index.cfm/page/main.collectionD...

 

Category:

 

Science & Technology

 

 

05:56 Gepost in Web | Permalink | Commentaren (0) | Tags: hubble, ultra deep field |  Facebook |

08-11-10

Missing Milky Way Dark Matter

 

8 november 2010

DarkMatterintheMilkyWay.jpg

Although dark matter is inherently difficult to observe, an understanding of its properties (even if not its nature) allows astronomers to predict where

its effects should be felt.


The current understanding is that dark matter helped form the first galaxies by providing gravitational scaffolding in the early universe.


These galaxies were small and collapsed to form the larger galaxies we see today.


As galaxies grew large enough to shred incoming satellites and their dark matter, much of the dark matter should have been deposited in a flat structure in

spiral galaxies which would allow such galaxies to form dark components similar to the disk and halo.


However, a new study aimed at detecting the Milky Way‘s dark disk have come up empty.

 

copyrights,credits : http://www.universetoday.com/77662/missing-milky-way-dark...