The more scientists study dark matter, the lesser they know and they are not particularly optimistic about their results.
After completing this study, we know less about dark matter than we did before," said Matt Walker, of the Harvard-Smithsonian Center for Astrophysics.
A mysterious and still unknown substance is totally invisible in the Universe and reveals
its presence only through its gravitational pull.
It does not emit any light, but it affects the ordinary matter such as stars, gas, neutrinos and various heavy elements
( 5% of the present composition of the Universe).
For example, it's crucial for stars, which would fly off in all directions - without dark matter.
Otherwise, the nature of dark matter is a mystery. No one knows what it consists of and no one has seen it, because it
doesn't interact with the matter scientists know about.
The composition of the known Universe: shown are the contributions from Dark Energy, Dark Matter and ordinary matter made of Standard Model particles. Photo Credits: MPIK
A working assumption is that dark matter consists of "cold" (i.e. slow-moving) exotic particles clump together gravitationally.
Over time these dark matter clumps grow and attract normal matter, forming the galaxies we see today.
Cosmologists used powerful computers to simulate this process and the subject were two dwarf galaxies.
They are ideal objects to study dark matter, since it represents 99% of their composition.
Computer modeling of this phenomenon indicates that dark matter should be densely packed in the centers of galaxies.
But it's not!
The simulations do not match performed measurements of two dwarf galaxies showing that the galaxies contain a smooth distribution of dark
matter and are less dense than they should be - if they held cold dark matter.
A mysterious and still unknown substance is totally invisible in the Universe - dark matter.
"Our measurements contradict a basic prediction about the structure of cold dark matter in dwarf galaxies. Unless or until theorists
can modify that prediction, cold dark matter is inconsistent with our observational data," Walker stated.
It means that either normal matter affects dark matter more than scientists expected, or dark matter is not "cold."
The researchers analyzed the dark matter distribution in: the Fornax and Sculptor dwarf galaxies, which contain one million
to 10 million stars and analyzed speeds and chemical compositions of 1500 to 2500 stars.
It seems that the commonly accepted cosmological model may be wrong and should be revisited.
In other words, secret dark matter forces scientists to accept the "Paradigm Shift".
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Abnormal Star Discovered In The 'Forbidden Zone'
A team of astrophysicists from Germany, France and Italy have discovered in the constellation Leo is an old star.
The star's existence raised at once many questions for scientists.
The object is definitely not as its "contemporaries" that appeared immediately after the Big Bang event.
The Eyes Of A Future Alien Astronomer - What Will They See?
Have you ever wondered what the Universe will look like for a future alien astronomer?
It will in fact be entirely different from what it is today.
One trillion years from now, an alien astronomer in our galaxy will have great difficulties figuring out how the universe began.
The Milky Way will have merged with the Andromeda galaxy to form the Milkomeda galaxy. Many of its stars, including our Sun, will have burned out.
Violent Dragon Clash Billions Of Years Ago
NGC 5907 is sometimes called the "Splinter" or Knife Edge Galaxy because of its unusual appearance.
It is a spiral galaxy lying in the Dragon constellation,
about 40 million light-years from Earth that could have been formed through a gigantic collision of galaxies, 8 to 9 billion years ago.
The "Cloaked" Star Was Difficult To Find
An object obscured by dust, and buried in a two-star system enshrouded by dense gas, is not easy to find.
A "cloaked" star was discovered after it ate a little of its neighbor. The meal must have given the star a bit of indigestion, because it
"burped" with a blast of high-energy radiation, which gave it away.
Very Old Cluster Densely Packed With Millions Of Stars
Extensively studied in the literature and one of the oldest known among deep sky objects is NGC 6752.
It is a crowded globular cluster, filled with hundreds of thousands of stars and has its location approximately
13,000 light-years from Earth, in the Pavo constellation...
Invader From Another Galaxy
This alien intruder from another galaxy is in many ways different from other exoplanets observed by astronomers.
Located about 2000 light-years from Earth in the southern constellation of Fornax (the Furnace), the Jupiter-like planet orbits a dying star of
extragalactic origin and risks to be engulfed by it.
Power To See Most Distant Objects In The Universe
The 3C294, is one of the most distant galaxies recorded by Chandra, the most sophisticated X-ray observatory ever built.
The cluster 3C294 is even 40 percent farther (!) than the next most distant x-ray galaxy cluster.
Chandra focus on X-rays from high-energy regions of the Universe and see the invisible.
It is so sensitive that it can capture images of particles as they disappear into a black hole deep in outer space.