3 New Posts Including Researchers may have Detected First Signs of Dark Matter |
- Researchers may have Detected First Signs of Dark Matter
- New Rosetta Data Suggest Earth’s Water Didn’t Come From Comets
- New Radical Theory of Time: The Big Bang may have Created a Parallel Universe?
Posted: 12 Dec 2014 02:22 AM PST
Dark
matter seemed to be a myth to some scientists and a catch-all to
others, using it to explain gravitational forces and the orbits of
objects in space that just couldn’t be accounted for by the existence of
observable, physical matter. It has been theorized that dark matter
existed and affected the way the universe functioned as much as physical
matter, but until now, dark matter has only been a theory.
More… • Strange and Rare Galaxy Puzzled Astronomers • New Rosetta Data Suggest Earth’s Water Didn’t Come From Comets Researchers with the European Space Agency say they’ve detected a strange spike in X-rays coming from two cosmic locations — the Andromeda Galaxy and the Perseus Cluster. The astronomers think the strange emissions could be the signal of dark matter. If confirmed, it would be first direct evidence of dark matter.
Researchers
have detected what they believe is the signal of a particle of dark
matter coming from the Perseus Cluster and Andromeda Galaxy (click to
zoom)
X-ray observations from the orbiting XMM-Newton telescope were
examined by the researchers. They removed all signals from known sources
and particles. A signal remained that could not be explained by
astronomers, through the actions of ordinary matter.
“The signal’s distribution within the galaxy corresponds exactly to
what we were expecting with dark matter, that is, concentrated and
intense in the center of objects and weaker and diffuse on the edges,”
study co-author Oleg Ruchayskiy, of the École Polytechnique Fédérale de
Lausanne (EPFL) in Switzerland, said in a statement.
Want to stay on top of all the space news? Do Not Forget To Follow Us:“With the goal of verifying our findings, we then looked at data from our own galaxy, the Milky Way, and made the same observations,” added lead author Alexey Boyarsky, of EPFL and Leiden University in the Netherlands. Physicists estimate the universe has four times more dark matter than normal matter. But because the sole effect dark matter has on ordinary matter is through gravitation, scientists have not been able to pinpoint evidence of dark matter’s existence. Scientists have proposed a number of different exotic particles as the constituents of dark matter, including weakly interacting massive particles (WIMPs), axions and sterile neutrinos, hypothetical cousins of “ordinary” neutrinos (confirmed particles that resemble electrons but lack an electrical charge). The decay of sterile neutrinos is thought to produce X-rays, so the research team suspects these may be the dark matter particles responsible for the mysterious signal coming from Andromeda and the Perseus cluster. “Confirmation of this discovery may lead to construction of new telescopes specially designed for studying the signals from dark matter particles,” Ruchayskiy’s research partner, Alexey Boyarsky, said. “We will know where to look in order to trace dark structures in space and will be able to reconstruct how the Universe has formed.” Have something to say? Let us know in the comments section or send an email to the author. You can share ideas for stories by contacting us here. • Abstract Study Source: http://goo.gl/mHi2Hn. • If any image will be removed (the image are hosted by a specialized site, due to their size), please contact us. • If you like this article please share and comment it. |
Posted: 11 Dec 2014 09:46 AM PST
Take
a virtual trip around the Solar System and you’ll come to one
conclusion pretty quickly: Earth is odd. One of the most significant
oddities about our pale blue dot is the vast quantity of liquid water.
Astronomers and other scientists have proposed various arguments for how
Earth ended up with huge, stable liquid oceans — and now, thanks to
research from the Rosetta probe, we’ve got evidence that one prominent
theory may not be correct.
More… • Massive Population Of Stars is Missing, Scientists are Confused ! • “Eye of Sauron” Helps Astronomers Measure Cosmic Distances The European Space Agency’s (ESA) Rosetta spacecraft has found the water vapor from its target comet to be significantly different from that found on Earth. The discovery fuels the debate on the origin of our planet’s oceans. The measurements were made in the month following the spacecraft’s arrival at Comet 67P/Churyumov-Gerasimenko on August 6. It is one of the most anticipated early results of the mission because the origin of Earth’s water is still an open question.
Rosseta and Philae
The young Earth was a hot place — so hot that most of its surface water evaporated.
At the time, about four billion years ago, the solar system was
swarming with asteroids and comets. They pelted Earth’s surface,
prompting scientists to hypothesise that maybe it was these objects that
helped supply Earth with its oceans. Because comets are known to
contain water, they seemed a likely source.
Want to stay on top of all the space news? Do Not Forget To Follow Us:If this were the case, then the chemical signature of Earth’s water would match what is found on comets. Water, of course, is H2O: two parts hydrogen and one part oxygen. It can be made from regular hydrogen, which consists of a proton and an electron, or from a type of hydrogen called deuterium, which has an added neutron. “This surprising finding could indicate a diverse origin for the Jupiter-family comets – perhaps they formed over a wider range of distances in the young Solar System than we previously thought,” said Dr Kathrin Altwegg of the University of Bern, Switzerland, who is the principal investigator for ROSINA and the lead author of a paper published in the journal Science. “We knew that Rosetta’s in-situ analysis of this comet was always going to throw up surprises for the bigger picture of solar system science, and this outstanding observation certainly adds fuel to the debate about the origin of Earth’s water,” said Matt Taylor from ESA. “As Rosetta continues to follow the comet on its orbit around the Sun throughout next year, we’ll be keeping a close watch on how it evolves and behaves, which will give us unique insight into the mysterious world of comets and their contribution to our understanding of the evolution of the solar system.” This new data isn’t exactly a slam-dunk against the theory of panspermia, which generally holds that life (or molecules vital to the eventual formation thereof) were distributed to Earth from another source, but it does imply that there’s no currently known smoking gun that would tie Earth’s water supply to a vital extraterrestrial source. Have something to say? Let us know in the comments section or send an email to the author. You can share ideas for stories by contacting us here. • Study Source: http://goo.gl/bnZMJU. • If any image will be removed (the image are hosted by a specialized site, due to their size), please contact us. • If you like this article please share and comment it. |
Posted: 11 Dec 2014 03:51 AM PST
Why
does time only go in one direction? And why is the future so different
from the past? They seem obvious questions, but they have troubled
scientists for over a century. A new theory has proposed an answer —
that time doesn’t run just one way, and that there is another universe, a mirror of ours, where time runs backwards.
More… • New Horizons Spacecraft will Step On Pluto after 9 Years in Space • Earth is Being Protected by Invisible Space Shield From ‘Killer Electrons’ That’s what a team of scientists argue, including Julian Barbour of the University of Oxford, Tim Koslowski of the University of New Brunswick and Flavio Mercati of the Perimeter Institute for Theoretical Physics.
Big Bang
They analysed a computer simulation model of 1000 particles under
the influence of Newtonian gravity, focusing on the dynamic behaviour
and distance between the particles.
Ultimately, they found that, regardless of size and amount, every
configuration of particles would evolve into what’s known as a
low-complexity scale. They then expand outward in both directions,
creating two different, and opposite “arrows of time”.
Want to stay on top of all the space news? Do Not Forget To Follow Us:“Along each of the two temporal paths, gravity then pulls the particles into larger, more ordered and complex structures — the model’s equivalent of galaxy clusters, stars and planetary systems. From there, the standard thermodynamic passage of time can manifest and unfold on each of the two divergent paths. However, he notes much more work needs to be done in looking at how time works. “This is opening up a completely new way to think about a fundamental problem, the nature of the arrow of time and the origin of the second law of thermodynamics. “But really we’re just investigating a new aspect of Newton’s gravitation, which hadn’t been noticed before. Who knows what might flow from this with further work and elaboration?” Have something to say? Let us know in the comments section or send an email to the author. You can share ideas for stories by contacting us here. • Source: http://goo.gl/q3CEzD. • If any image will be removed (the image are hosted by a specialized site, due to their size), please contact us. • If you like this article please share and comment it. |
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