About of DARK MATTER
Chandra :: Field Guide to X-ray Astronomy :: Dark Matter Mystery
A brief popular science type introduction to the subject.
Dark Matter Mystery While carefully measuring the speed of rotation of galaxies, astronomers stumbled upon a profound cosmic mystery
Primer on Dark Matter
Very concise illustrated overview with links to relevant topics and sub-topics.
A Primer on Dark Matter FIGURE: Superposed on an optical picture of a group of galaxies is an X-ray image taken by
There are many reasons to believe that the universe is full of 'dark matter', matter that influences the evolution of the universe gravitationally, but is not seen directly in our present observations
The adjacent image exhibits one recent piece of evidence for undetected matter: the hot gas seen in the X-ray spectrum would have dispersed if it were held in place only the by gravity of the mass that is producing light in this image (the so-called 'luminous mass')
The nature of this dark matter, and the associated 'missing mass problem', is one of the of modern astrophysics
The following is a brief tutorial on this issue extracted from an informal email message: If inflation is correct then, since luminous stars and galaxies only contribute 0.5% of the closure density, then 99% of the Universe is in the form of dark matter and this, no doubt, must be a particle
hot dark matter) and therefore they erase fluctuations on small scales (they free stream and fill the horizon in the early universe)
UK Dark Matter Collaboration
UK search for Galactic WIMP dark matter.
What is Dark Matter?
From the Usenet Physics FAQ.
What is Dark Matter? The story of dark matter is best divided into two parts
Why the Universe Needs Dark Matter We believe that that the Universe is critically balanced between being open and closed
It requires a certain amount of matter to accomplish this result
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
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
Where is the other 99% of the stuff of the Universe? Dark Matter! So there are two conclusions
We only see 0.01 M out of 0.05 M baryonic matter in the Universe
The rest must be in baryonic dark matter halos surrounding galaxies
And there must be some non-baryonic dark matter to account for the remaining 95% of the matter required to give omega, the mass of the Universe, in units of critical mass, equal to unity
info: DARK MATTER
Photo by www.newscientist.com
CDMS Home Page
Cryogenic Dark Matter Search; searching for WIMPs with large germanium crystal
cooled to 20 mK.
Welcome to the C ryogenic D ark M atter S earch Homepage Collaborator Websites: and (Scientific, with explanations of the dark matter problem, WIMPs and our detectors) Download the about our activities at the Soudan facility Scientific Results At Soudan (underground): Results from second run at Soudan posted: astro-ph/0509259 and First results at the Soudan facility published in Phys
and more CDMS publications (Learn about dark matter and the universe -- for the public!) Download a Powerpoint file of our education which is on display at the Soudan mine Photos Have a look at our experiment site, people and equipment!
Dark Matter Telescope
Information, design, images, the science, team, news and events, education and
outreach, and FAQ.
White Dwarfs Shed Light on Dark Matter
Report (March 23/01) of astronomical evidence suggesting white dwarf stars are
a potential source for dark matter. Findings also contribute to stellar evolution ...
White dwarfs shed light on dark matter BY JEFF FOUST SPACEFLIGHT NOW Posted: March 23, 2001 A white dwarf, WD 0346, first reported by Nigel C
Some of the invisible 'dark matter' that makes up most of the mass of our galaxy may be in the form of previously undetected white dwarf stars, astronomers reported this week
The mystery of dark matter dates back to the 1930s, when astronomer Fritz Zwicky measured rotation rates of galaxies that were much higher than expected given their estimated masses
The only way to explain those high rotation rates, he concluded, was that the galaxy was much more massive than estimated because of the existence of unseen, or dark, matter
This could only be explained if the galaxies were embedded in a much larger halo of dark matter
Astronomers now estimate that 95 percent of the mass of galaxies like the Milky Way is in the form of dark matter
While astronomers were able to quantify the amount of dark matter, they have been unable to determine its composition
The rest is in the form of baryonic, or ordinary, matter
In contrast to WIMPs, baryonic matter is thought to be aggregated into bodies called massive compact halo objects: MACHOs, in a deliberate twist of nomenclature
Dark Matter Magazine - A Webzine and Blog
A monthly focus on art, music, science and technology.
Dark Matter Magazine is a webzine and blog that focuses on, and
Dark Matter blogs feature news and opinions on , and, and, and
By Topic : These are links to articles in past issues of Dark Matter Webzine
Art Humor Science Technology Games Music Words By Issue : These are links to past issues of Dark Matter Webzine FEBRUARY 2004 Photography by Ronan Spelman, Star Wars: Jedi Knight Academy 2 Clan TSS, Fiction by Fernando Sorrentino, Bob Mottram's Rodney the Robot, Occam's Razor DECEMBER 2003 Photography by Ashley Fontenot, Martin Atkins of Pigface, Fiction by John Forest-Bamberger, Desert Combat Clan =]NSF[=, Human Genome Project OCTOBER 2003 Photography by Roy Caratozzolo, A Perfect Circle, Sigmund Freud, Battlefields 1942 Mods, Codes and Ciphers AUGUST 2003 Photographer Jeffery Scott, Superjoint Ritual, Inside a US Election, DIVX to DVD, The Sun JULY 2003 Surreal Painter Ray Bartrip, Master of Orion3, The National Do-Not-Call List, Stonedgecko .com's Franklin T, Interstellar Internet JUNE 2003 Art by Nonhumans, Superjoint Ritual, Conflict of Interest Crossword Puzzle, PC vs
Benefits
Photo by astron.berkeley.edu
Tate Britain | Cornelia Parker Cold Dark Matter: An Exploded View Interactive multimedia exploration of Cornelia Parker's Cold,
Dark Matter: An
Exploded View (1991).
Tate Collection Advanced Search Works in Focus Welcome to an interactive multimedia exploration of Cornelia Parker's Cold, Dark Matter: An Exploded View (1991)
Many different photographs of Cold Dark Matter: An Exploded View are used in this project from full views to details, including installation shots
Cold Dark Matter: An Exploded View 1991 Mixed media
Is Dark Matter Theory or Fact?
From Scientific American: Ask the Experts: Physics.
CURRENT ISSUE HIGHLIGHTS: - WEB HIGHLIGHTS: SEARCH Magazine Content September 14, 2006 | : Is dark matter theory or fact? Julio Vargas Guatemala City, Guatemala 1 This answer was provided by physicists Rhett Herman of Radford University in Radford, Va
Dark matter is just what its name implies; it is matter (or mass) in the universe that we cannot see directly using any of our telescopes
ADVERTISEMENT (article continues below) Dark matter does not reveal its presence by emitting any type of electromagnetic radiation
It is truly 'dark.' Cosmologists believe we can only see about 10 percent of the matter in the universe
How, then, can we say with confidence that we know dark matter exists? The way in which dark matter reveals its presence to us is through the gravitational effect it exerts on luminous matter in the universe
('Luminous' matter is the matter we can see with our telescopes.) The most obvious example of the gravitational effects of dark matter can be observed when looking at the rotation of galaxies
Dark Matter
Download the game, and character, chip, monster, and background sets as well.
Dark Matter Version 1.0 is now out! Welcome to the Dark Matter web site
Dark Matter is a role-playing game written using RPG Maker 95
Hence Dark Matter
This site has been set-up so you can download all the elements that went into creating Dark Matter
Well, I hope you have as much fun playing Dark Matter as I had writing it
Dark Matter Press, independent publishing, publisher of 'Fatal ...
Independent publisher of books, fine art photos and fine art prints.
What keeps all Creation from flying asunder? What saves Einstein's Constant from being a blunder? What solves the cosmologist's densest conunder? Dark matter! Dark Matter Press Dark Matter Press is an independent publishing house
In cosmology, 'dark matter' is the unseen substance that provides enough gravity to hold the universe together, but not so much gravity that the universe implodes; at least not right away
At Dark Matter press, we publish work that has enough gravity to make you think, but not so much that your brain implodes; at least not right away
DARK MATTER ?
MACHO Project Home Page
Primary aim is to test the hypothesis that a significant fraction of the dark
matter in the halo of the Milky Way is made up of objects like brown dwarfs or ...
Versions of more recent than 1.12 will display J2000.0 coordinates if launched with: saoimage -gd 800x800 -fits R_LMC.fits Publications Data New New New Demos Other MACHO Project Web Servers Other Dark Matter Search Links DUO Acknowledgements Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, US Department of Energy NSF-supported Center for Particle Astrophysics at the University of California at Berkeley, Santa Barbara, and San Diego Australian National University Doug Welch Last updated: 2005 June 23
Physics News Update Number 446 - Story DARK MATTER ANNIHILATION AT ...
Physics News Update.
CNN.com - Dwarf galaxy swarms boost dark matter theory - May 22, 2002
[CNN]
Dark Matter: Swedish (and worldwide) military aviation
Technical and historical information on Swedish military aviation.
Dark Matter: Swedish (and worldwide) military aviation Military aviation, Swedish and worldwide Here you'll mainly find technical and historical information on Swedish military aviation
Dark Matter Radio Broadcast
An informative radio transcript of two scientists talking about dark matter.
The first question is 'What is dark matter?' Professor Samuel: Well, dark matter is one of the greatest puzzles of modern astronomy
Astronomers had once assumed that the gravity of galaxies was almost entirely generated by visible matter, that is, the matter in the stars and gas which give off or interact with light
This is a great mystery -- it is the mystery of dark matter
Well, it's unclear because we don't know exactly what dark matter is
[ah] Dark matter is non-luminous material
Perhaps [ah] to clarify things we probably should discuss in more detail what luminous matter is
Luminous matter is that which gives off light or interacts with light
But during the last several decades, astronomers have come to realize that most of the mass of the universe is some unknown material, which they've named dark matter
Dark matter, by definition, does not give off or absorb light
Professor Kaku: So, in other words, if you had dark matter, it would be invisible, but if you dropped it on your foot, you'd feel it? Professor Samuel: [ah] Probably not
[ah] Again, we don't know exactly the make up of dark matter
[astro-ph/9904251] The Early History of Dark Matter
The history of the discovery of dark matter in the Universe is reviewed.
Emphasis on early work by Zwicky (1933), Smith (1936), Babcock (1939) and Oort (1940).
[] Date: Mon, 19 Apr 1999 22:43:16 GMT (75kb) The Early History of Dark Matter Authors: Comments: Will be published in the June 1999 issue of PASP The history of the discovery of dark matter in the Universe is briefly reviewed
Dark Matter
An individual interpretation on the structure of the Universe.
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