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What's Pulling the Milky Way Towards It at 14-Million MPH? (Today's Most Popular)

6a00d8341bf7f753ef0120a68d662a970b-500wi Astronomers have known for years that something unknown apears to be "pulling" our Milky Way and tens of thousands of other galaxies toward itself at a breakneck 22 million kilometers (14 million miles) per hour. But they can't pinpoint exactly what, or where it is.

One of the most fascinating discoveries of our new century may be on hand if the Large Hadron Collider (LHC) outside Geneva produces nano-blackholes. According to the best current physics, nano blackholes could not be produced with the energy levels the LHC can generate, but could only come into being if a parallel universe were providing extra gravitational pull. 

Versions of multiverse theory suggest that there is at least one other universe very close to our own, perhaps only a millimeter away. This makes it possible that some of the effects, especially gravity "leak through," which could be responsible for the production of dark energy and dark matter that are believed to make up 96% of the universe.

A huge volume of space that includes the Milky Way and super-clusters of galaxies is flowing towards a mysterious, gigantic unseen mass that astronomers have dubbed "The Great Attractor," some 250 million light years from our Solar System.

The Milky Way and Andromeda galaxies are the dominant structures in a galaxy cluster called the Local Group which is, in turn, an outlying member of the Virgo supercluster. Andromeda--about 2.2 million light-years from the Milky Way--is speeding toward our galaxy at 200,000 miles per hour.

This motion can only be accounted for by gravitational attraction, even though the mass that we can observe is not nearly great enough to exert that kind of pull. The only thing that could explain the movement of Andromeda is the gravitational pull of unseen mass--perhaps the equivalent of 10 Milky Way-size galaxies--lying between the two galaxies. Meanwhile, our entire Local Group is hurtling toward the center of the Virgo Cluster (image above)  at one million miles per hour.

Even so, adding this invisible material to luminous matter brings the average mass density of the universe still to within only 10-30 percent of the critical density needed to "close" the universe. This phenomena suggests that the universe be "open." Cosmologists continue to debate this question, just as they are also trying to figure out the nature of the missing mass, or "dark matter."

It is believed that this dark matter dictates the structure of the Universe on the grandest of scales. Dark matter gravitationally attracts normal matter, and it is this normal matter that astronomers see forming long thin walls of super-galactic clusters.

Recent measurements with telescopes and space probes of the distribution of mass in M31 -the largest galaxy in the neighborhood of the Milky Way- and other galaxies led to the recognition that galaxies are filled with dark matter and have shown that a mysterious force—a dark energy—fills the vacuum of empty space, accelerating the universe's expansion.

Astronomers now recognize that the eventual fate of the universe is inextricably tied to the presence of dark energy and dark matter.The current standard model for cosmology describes a universe that is 70 percent dark energy, 25 percent dark matter, and only 5 percent normal matter.

We don't know what dark energy is, or why it exists. On the other hand, particle theory tells us that, at the microscopic level, even a perfect vacuum bubbles with quantum particles that are a natural source of dark energy. But a naïve calculation of the dark energy generated from the vacuum yields a value 10120 times larger than the amount we observe. Some unknown physical process is required to eliminate most, but not all, of the vacuum energy, leaving enough left to drive the accelerating expansion of the universe.

A new theory of particle physics is required to explain this physical process.

The universe as we see it contains only the stable relics and leftovers of the big bang: unstable particles have decayed away with time, and the perfect symmetries have been broken as the universe has cooled, but the structure of space remembers all the particles and forces we can no longer see around us. 

Discovering what it is that makes up the heart of the "Great Attractor" -- will surely rank as one of the greatest discoveries in the history of science.

Recent findings suggest these motions are the result of gravitational forces from not one, but two things: the Great Attractor, and a conglomerate of galaxies far beyond it.

The location of the Great Attractor was finally determined in 1986 and lies at a distance of 250 million light years  from the Milky Way, in the direction of the Hydra and Centaurus constellations. That region of space is dominated by the Norma cluster, a massive cluster of galaxies, and contains a preponderance of large, old galaxies, many of which are colliding with their neighbors, and or radiating large amounts of radio waves.

Major concentration of galaxies lies beyond the Great Attractor, near the so-called Shapley Supercluster, 500 million light-years away—the most massive known super-cluster. Mapping X-ray luminous galaxy clusters in the Great Attractor region has shown that the pull our galaxy is experiencing is most likely due to both the nearby Great Attractor and these more distant structures.

In the 1987, a group of astronomers known as the "Seven Samurai," at Cal Tech  uncovered this coordinated motion of the Milky Way and our several million nearest galactic neighbors. They found that galaxies are very unevenly distributed in space, with galactic super-clusters separated by incredibly huge voids of visible ordinary matter. The place towards which we all appear headed was originally called the New Supergalactic Center or the Very Massive Object until one of the discoverers, Alan Dressler, decided they needed a more evocative name and came up with "The Great Attractor."

The motion of local galaxies indicated there was something massive out there that are pulling the Milky Way, the Andromeda Galaxy, and other nearby galaxies towards it. For a while, nobody could see what it was, because it lies behind the plane of our Galaxy --- that means the gas and dust in our Galaxy obscures the light from the Great Attractor, and it is outshone by the stars and other objects in our Galaxy.

The Great Attractor is a diffuse concentration of matter some 400 million light-years in size located around 250 million light-years away within the so-called "Centaurus Wall" of galaxies , about seven degrees off the plane of the Milky Way. X-ray observations with the ROSAT satellite then revealed that Abell 3627 is at the center of the Great Attractor. It lies in the so-called Zone of Avoidance, where the dust and stars of the Milky Way's disk obscures as much as a quarter of the Earth's visible sky.


Posted by Casey Kazan. 


Image credit: Wally Pacholtz

http://www.solstation.com/x-objects/great

http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/990924a2.html

http://www.world-science.net/exclusives/060419_attractorfrm.html

Comments

From the descriptions it would seem that one small section of the universe, that includes us and our galactic neighbours, is being drawn through a relatively stationary region of space... Is the Great Attractor, like a black hole, pulling everything towards it in a spherical pattern from all directions or is it, like a super-sized vacuum cleaner, only pulling things from our general direction? Surely that must be observed and defined before any physics can be done.

Bet you 100 bucks its not gravity

john deere is a great tractor.

Is it possible that the milky way - along with the local group - is actually orbiting say, Abell-3627??

That thing sucks!

Abel 3627 is maybe the local centre of the universe. Did anyone do any relativistic calculations on the mass, taking into account the cubic growth in 'effective mass' with relative speed, or is all matter assumed to be not moving in this 'dark matter needed' theory? Do you think the milky way is tilting into the plane of Abel 3627's spin? Do you think there's a reason for this, if true?

I know such talk of effective mass is not wanted as it elucidates toward creation of free energy or unbalanced momentum, but get a grip.

eeeewwwww
free energy ?
you devil spawn !
how dare you talk of such things !
your trying to bring about the end of the species for sure !
all us civilised folk know that free energy is the devils handy work and a road to abomination.
what else is to man that he is not his ego for all power that comes un to me is his to come unto him through his fellow labourers.
... ya gotta wonder aint ya.

i just wanted to say... that "faith" as we know it is the act of loving that which one chooses to not know without fear.
consider this...
what we can see is only a fraction of that which we measure by its ability to be in-between the spaces we know we can see anything in.
what is our measure ?
the sum of all the parts in-between that which we can see is many times greater than what we can see.

Lets burn down the observatory so this will never happen again

I'm thinking along the lines of a "Plasma Vortex Cannon" which would be a satellite that collects PLASMA from our aging hot Sun, and blasts it out in the direction of the Andromeda Galaxy, every 72 hours (for example). If we start NOW, and continue blasting for the next million years, by the time it reaches the Andromeda, it should be able to STEER us AWAY from colliding with the Andromeda Galaxy--or ANY galaxy that might be headed for us. It would orbit the Earth and run on solar panels like other satellites. Hot PLASMAS have peculiar velocities that are incredibly fast, especially "shocked" molecular Hydrogen, as observed in NGC 7318B (google Stephan's Quintet).

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