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Posted on Thursday.

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thenewenlightenmentage:

“First Evidence for Extraterrestrial Sources of High-Energy Neutrinos” —Reports Antarctica Observatory
Although cosmic rays were discovered 100 years ago, their origin remains one of the most enduring mysteries in physics. Until now. A massive telescope at the IceCube Neutrino Observatory in the Antarctic ice reports the detection of 28 extremely high-energy neutrinos that might have their origin in cosmic sources. Two of these reached energies greater than 1 petaelectronvolt (PeV), an energy level thousands of times higher than the highest energy neutrino yet produced in a manmade accelerator.
“We’re looking for the first time at high energy neutrinos that are not coming from the atmosphere,” says Francis Halzen, principal investigator of IceCube and the Hilldale and Gregory Breit Distinguished Professor of Physics at University of Wisconsin–Madison. “This is what we were looking for,” he adds.
Because they rarely interact with matter and are unimpeded by gravity, neutrinos can carry information about the workings of the highest-energy and most distant phenomena in the universe. Though billions of neutrinos pass through the Earth every second, the vast majority originate either in the sun or in the Earth’s atmosphere. Far rarer are high-energy neutrinos that may hail from the most powerful cosmic events — such as gamma ray bursts, black holes, or star formation — where they would be created in association with high-energy cosmic rays that can reach energies up to thousands of PeVs.

Postdoctoral fellow Nathan Whitehorn described 28 high-energy neutrino events captured by the detector between May 2010 and May 2012. These events, including two that exceeded the unprecedented energy level of 1 PeV, were one of the main goals for building a detector such as IceCube.
“Their properties are strongly inconsistent with what you would expect of atmospheric sources and are almost exactly what you would expect from an astrophysical source,” Whitehorn says. It is premature to speculate where these neutrinos originated, he adds, but the IceCube collaboration is continuing to refine and expand the analysis.
IceCube is comprised of more than 5,000 digital optical modules suspended in a cubic kilometer of ice at the South Pole. The National Science Foundation-supported observatory detects neutrinos through the tiny flashes of blue light produced when a neutrino interacts with a water molecule in the ice.

The first hints of high-energy neutrinos came with the unexpected discovery in April 2012 of two detector events above 1 PeV. An analysis of those events was reported last month in a paper submitted to the journal Physical Review Letters. An intensified search, led by Whitehorn and fellow WIPAC scientists Claudio Kopper and Naoko Kurahashi Neilson, turned up 26 additional events exceeding 30 teraelectronvolts (TeV; one-thousandth of a PeV), which will be described in a forthcoming publication.
The Daily Galaxy via http://www.news.wisc.edu/21790

really fun assignment for TNYT Sunday Review about the new D.S.M.-5!

i included the sketch here because the guy’s face still makes me laugh. in the end i changed his pose to make it more clear that he was scared of the cockroach.

thank you AD ▲▼┃▼▲ !

Posted on Thursday, 16 May with 1,486 notes.

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-chicagobulls:

bosses.

(Source: margherita-mattera)

Posted on Saturday, 4 May with 732 notes.

Posted on Saturday.

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odditiesoflife:

The Quietest Place on Earth
This is the quietest place on Earth. It’s so quiet that you can hear the sounds of your own heart and stomach. The average person can only spend about 30 minutes in this room before they start hallucinating.
According to Guinness World Records, 2005, Orfield Laboratory’s anechoic chamber (pictured above) is “The quietest place on Earth” measured at −9.4 decibels. However, the University of Salford has a number of anechoic chambers, one of which is unofficially the quietest in the world having a measurement of −12.4 decibels.
The purpose of an anechoic chamber is for testing the response of loudspeakers or microphones because the room doesn’t affect the acoustic measurements. It is also the best place for virtual acoustics - generating auralizations of concert halls, city streets and other spaces.

Posted on Saturday.

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nationalaquarium:

Meet our new orbicular burrfish!
While they may look sweet, these fish have a mean bite! They’re mouth structures are built for crushing hard-shelled invertebrates. Learn more about this species in today’s Animal Update!

Posted on Monday.

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A+

Posted on Monday, 29 April with 40,647 notes.

Posted on Monday.

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invisibleimpression:

Second shot in Marat Kazei Park. 16/04/2013