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Planificar nuestras clases con TIC para enseñar en la escuela | Recursos educ.ar

Planificar nuestras clases con TIC para enseñar en la escuela | Recursos educ.ar | didáctica | Scoop.it
educ.ar es el portal educativo de la Nación, destinado a ejecutar las políticas definidas por el Ministerio de Educación en materia de integración de las Tecnologías de la Información y la Comunicación en el sistema educativo.
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Lobster Nebula Shell Removed By 'Infrared Cracker', Reveals Hot New Stars

Known to astronomers as NGC 6357, the nebula is located more than 8,000 light-years from Earth. NGC 6357 is homed to the Pismis-24 star cluster, once thought to the single most massive star. It was later discovered that three massive stars were responsible for the illusion.

 

“One of the bright young stars in NGC 6357, known as Pismis 24-1, was thought to be the most massive star known — until it was found to actually be made up of at least three huge bright stars, each with a mass of under 100 times that of our sun,” the international space agency said in a statement released Wednesday. “Even so, these stars are still heavyweights — some of the most massive in our Milky Way. Pismis 24-1 is the brightest object in the Pismis 24 star cluster, a bunch of stars that are all thought to have formed at the same time within NGC 6357.”

 

The image could provide astronomers with a large amount of data on how young stars grow and evolve in the universe. The image is the first to view the nebula through the prism of infrared, which penetrates much of the dust that cloaks the nebula. Infrared can capture a number of features often invisible to optical telescopes. The image itself is a stunning example of coordination among the world’s leading space agencies. The pair of telescops reportedly produced visible-light images of various parts of this region. The images captured were then compared to new infrared image, providing astronomers with an unprecedented view of the nebula.

 

The latest image is part of a much large project dubbed VISTA Variables in the Via Lactea (VVV), an attempt to survey large portions of the Milky Way galaxy. The telescope, the largest ever built, is allowing astronomers to view the universe as never before. Earlier this year, the telescope produced one of the most detailed images of the Milky Way. The staggering 9-gigapixel picture contained data on nearly 80 million stars and 173 million different objects in the galaxy, ESO officials said at the time.

 


Via Dr. Stefan Gruenwald
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New way to probe Earth's deep interior using particle physics proposed

New way to probe Earth's deep interior using particle physics proposed | didáctica | Scoop.it

Researchers from Amherst College and The University of Texas at Austin have described a new technique that might one day reveal in higher detail than ever before the composition and characteristics of the deep Earth.

There's just one catch: The technique relies on a fifth force of nature (in addition to gravity, the weak and strong nuclear forces and electromagnetism) that has not yet been detected, but which some particle physicists think might exist. Physicists call this type of force a long-range spin-spin interaction. If it does exist, this exotic new force would connect matter at Earth's surface with matter hundreds or even thousands of kilometers below, deep in Earth's mantle. In other words, the building blocks of atoms—electrons, protons, and neutrons—separated over vast distances would "feel" each other's presence. The way these particles interact could provide new information about the composition and characteristics of the mantle, which is poorly understood because of its inaccessibility.

 

"The most rewarding and surprising thing about this project was realizing that particle physics could actually be used to study the deep Earth," says Jung-Fu "Afu" Lin, associate professor at The University of Texas at Austin's Jackson School of Geosciences and co-author of the study appearing this week in the journal Science.

 

This new force could help settle a scientific quandary. When earth scientists have tried to model how factors such as iron concentration and physical and chemical properties of matter vary with depth—for example, using the way earthquake rumbles travel through the Earth or through laboratory experiments designed to mimic the intense temperatures and pressures of the deep Earth—they get different answers. The fifth force, assuming it exists, might help reconcile these conflicting lines of evidence.

 

Earth's mantle is a thick geological layer sandwiched between the thin outer crust and central core, made up mostly of iron-bearing minerals. The atoms in these minerals and the subatomic particles making up the atoms have a property called spin. Spin can be thought of as an arrow that points in a particular direction. It is thought that Earth's magnetic field causes some of the electrons in these mantle minerals to become slightly spin-polarized, meaning the directions in which they spin are no longer completely random, but have some preferred orientation. These electrons have been dubbed geoelectrons.


Via Dr. Stefan Gruenwald
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Hello world! « Experiências de físicas

Hello world! « Experiências de físicas | didáctica | Scoop.it
Welcome to WordPress.com! This is your very first post. Click the Edit link to modify or delete it, or start a new post. If you like, use this post to tell readers why you started this blog and what you plan to do with it.
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Climate Change: Very Soon The World Isn't Going To Look Like As It Did Before

Climate Change: Very Soon The World Isn't Going To Look Like As It Did Before | didáctica | Scoop.it

In a probable scenario for climate change, New Orleans will no longer exist. Neither will Atlantic City, N.J. Boston will look much like it did in the 17th century, before the city was dredged up to build a port. And Florida will no longer keep its distinct appendage shape.

 

These geographical changes due to sea-level rise are only the beginning, scientists bluntly stated at a briefing yesterday convened by Senate Environment and Public Works Committee Chairwoman Barbara Boxer (D-Calif.).

 

"Today's talk underscored what I already knew, but gives me more facts," said Boxer. "We have to act because our children and our grandchildren need us to act."

 

Storms are likely to travel in different patterns than they did before, much like Superstorm Sandy did. Increasing temperatures are changing the cycles of plants and trees and extending the pollination period to exacerbate allergies. In the hottest cities, it will be uncomfortable to step outside during the day. And limited agricultural growth will severely strain the world's ability to feed itself, said a panel composed of two atmospheric scientists, one public health expert and one biological oceanographer.

 

"The last two years [2011 and 2012] have had the largest number of billion-dollar events," said Donald Wuebbles, a professor of atmospheric sciences at the University of Illinois.

 

Rising temperatures will increase human exposure to mold, microbial pathogens and infectious diseases, said John Balbus, senior adviser for public health at the National Institute of Environmental Health Sciences. Studies are indicating that the greatest heat-related harm come may not from extreme exposure but rather from the lower but more frequent stress of increasingly hot summer days.

 

"We've seen the geographical range of ticks that cover Lyme disease shift northward, and is predicted to shift further northward in the United States and in Canada," said Balbus, adding that there are limited studies on the actual incidence of Lyme disease.

 

Melting ice is causing heat exchanges between the oceans and the atmosphere that were not possible before, said James McCarthy, a professor of biological oceanography at Harvard University.

 

"Storms like Superstorm Sandy that begin in the tropics and escape the tropics [now] because of the exceptionally warm surface water remain intense until landfall," he said. "When that storm hits, as it did, we have unprecedented potential for disruption."

 


Via Dr. Stefan Gruenwald
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Video collection of the Chelyabinsk meteorite that crashed into Lake Chebarkul, Russia

Video collection of the Chelyabinsk meteorite that crashed into Lake Chebarkul, Russia | didáctica | Scoop.it

The meteorite  on February 14th weighed about 10,000 tons. According to NASA, the power released during the explosion was equivalent to 500 kiloton, which is 30 times the power of the bomb that destroyed Hiroshima.

NASA experts describe the Chebarkul meteorite as the second largest since 1908, when a meteor hit Tunguska in Siberia. Such a meteor strike can be expected every 100 years, a NASA expert said.

 

Chelyabinsk meteorite fragments are already on sale on one of the most popular online auctions, Ebay. Not only the citizens of Russia are among the vendors but also Americans are involved.

 

Astronomers could not trace the Chelyabinsk meteor because this celestial body was approaching from the Sun, and telescopes did not see it in the sunshine, Deputy Director of the Sternberg Astronomical Institute at the Moscow State University Sergei Lamzin said. "It was impossible to detect it, because it was flying fromthe Sun. But if it was flying at night, our MASTER telescopes’network could have traced it", Lamzin said to journalists. MASTER telescopes can observe bursts in the Universe, watch comets, meteors and space debris. The system includes telescopes, located in the Tunka valley, Moscow region, Kislovodsk, in the Urals and in Blagoveschensk.

 

In the period of time around the fall of the Chelyabinsk meteor, the Russian Meteor weather satellite registered an increase in the concentration of water molecules in the orbit that possibly indicates that the space "guest" was a comet.

 

Researchers say the meteorite exploded into at least seven large pieces and hundreds of small ones. One of the bigger fragments plunged into the local Chebarkul Lake, forming an 8-meter ice hole.

 

REPORT is here: http://tinyurl.com/b8tbrkh


Via Dr. Stefan Gruenwald
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The educational network - Tiching

The educational network - Tiching | didáctica | Scoop.it
Tiching is an online platform that provides a search engine for digital learning content and a social network exclusively for the school learning community.
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