Tuesday, August 31, 2010

Cluster Collisions Switch on Radio Halos


This is a composite image of the northern part of the galaxy cluster Abell 1758, located about 3.2 billion light years from Earth, showing the effects of a collision between two smaller galaxy clusters. Chandra X-ray data (blue) reveals hot gas in the cluster and data from the Giant Metrewave Radio Telescope (GMRT) in India (pink) shows huge “halos” generated by ultra-relativistic particles and magnetic fields over vast scales. Optical data from the Digitized Sky Survey are colored gold.
A study of this galaxy cluster and 31 others with Chandra and the GMRT shows that huge radio halos are generated during collisions between galaxy clusters. This result implies that galaxy clusters with radio halos are still forming, while clusters without this radio emission are not still accumulating large amounts of material. The result also implies that relativistic electrons are likely accelerated by turbulence generated by mergers between clusters.
Galaxy clusters are the largest structures in the Universe that are bound together by gravity. They form when smaller clusters or groups of galaxies collide and merge. Collisions between galaxy clusters, such as this one in Abell 1758 and its more famous cousin the Bullet Cluster, are the most energetic events in the Universe since the Big Bang. Their growth rate over the last 7 billion years has been slowed by the effects of dark energy, as shown by previous studies with Chandra.
Credits: X-ray (NASA/CXC/SAO/M.Markevitch); Radio (TIFR/GMRTSAO/INAF/R.Cassano, S.Giacintucci); Optical (DSS)

Monday, August 30, 2010

Emmy Winners Revel in Their Recognition

Los mineros chilenos saludan a sus familiares desde abajo

NASA: Galaxy at the Edge


Spiral galaxy NGC 4921 presently is estimated to be 320 million light years distant. This image, taken by the Hubble Space Telescope, is being used to identify key stellar distance markers known as Cepheid variable stars. The magnificent spiral NGC 4921 has been informally dubbed anemic because of its low rate of star formation and low surface brightness. Visible in the image are, from the center, a bright nucleus, a bright central bar, a prominent ring of dark dust, blue clusters of recently formed stars, several smaller companion galaxies, unrelated galaxies in the far distant universe, and unrelated stars in our Milky Way Galaxy.
Image Credit: NASA, ESA, K. Cook (LLNL)

Friday, August 27, 2010

A Strange Ring Galaxy



Is this one galaxy or two? Astronomer Art Hoag first asked this question when he chanced upon this unusual extragalactic object. On the outside is a ring dominated by bright blue stars, while near the center lies a ball of much redder stars that are likely much older. Between the two is a gap that appears almost completely dark. How Hoag's Object formed remains unknown, although similar objects have been identified and collectively labeled as a form of ring galaxy. Genesis hypotheses include a galaxy collision billions of years ago and the gravitational effect of a central bar that has since vanished.


This image, taken by the Hubble Space Telescope in July 2001, reveals unprecedented details of Hoag's Object and may yield a better understanding. Hoag's Object spans about 100,000 light years and lies about 600 million light years away toward the constellation of the Snake (Serpens). Coincidentally, visible in the gap (at about one o'clock) is yet another ring galaxy that likely lies far in the distance.


Image Credit: NASA, R. Lucas (STScI/AURA)

La reserva indígena más pequeña de Brasil




En la reserva indígena más pequeña de Brasil viven alrededor de 400 personas. Y está justo en las afueras de Sao Paulo, una metrópoli de casi 12 millones de habitantes.

Está habitada por indios guaraníes, los pobladores originarios de la selva que solía cubrir toda esta región.

Las autoridades reconocen su derecho a tener más tierra, pero dicen que la creación de nuevas reservas es burocrática y lenta.

Chile: los mineros atrapados muestran cómo viven




Una cámara captó cómo viven los 33 mineros atrapados en la mina de San José, en Chile, desde el pasado 5 de agosto.

Los propios trabajadores explican cómo se organizan y se reparten las tareas en la cueva en la que tendrán que pasar aún varios meses.

Chilean mineres trapped underground in Copiapó


The 33 trapped miners: First line (left to right), Alex Vega Salazar, Ariel Ticona Yanez, Carlos Bugueno Alfaro, Calros Barrios Contreras, Carlos Mamani Solis, Claudio Acuna Cortes, Claudio Yanez Lagos, Daniel Herrera Campos, Dario Segovia Rojas, Edison Penaa Villarroel, Esteban Rojas Carrizo. Second line, Florencio Avalos Silva, Franklin Lobos Ramirez, Jimmy Sanchez Lagues, Jorge Galleguillos, Jose Ojeda Vidal, Jose Henriquez Gonzalez, Juan Illanes Palma, Juan Aguilar Gaete, Luis Alberto Urzua, Mario Gomez Heredia and Mario Seplveda Espina. Third line, Omar Orlando Reygada Rojas, Osman Isidro Araya Acuna, Pablo Amadeos Rojas Villacorta, Pedro Cortez, Raul Enriquez Bustos Ibanez, Renan Avalos Silva, Richard Villarroel Godoy, Samuel Avalos Acuna, Victor Segovia Rojas, Victor Zamora Bugueno, Yonny Barrios Rojas
Photograph: Diario Atacama/EPA
The Guardian

Chilean mineres trapped underground in Copiapó


Above ground, the gold and copper mine is a bustle of activity
Photograph: Ariel Marinkovic/AFP/Getty Images
The Guardian

Chilean mineres trapped underground in Copiapó


The names of the men trapped in the mine are displayed on a nearby hill
Photograph: Ivan Alvarado/Reuters
The Guardian

Chilean mineres trapped underground in Copiapó


Helen Avalos, whose husband, Jimmy Sanchez, is trapped underground, holds their two-month-old baby outside the mine
Photograph: Roberto Candia/AP
The Guardian

Chilean mineres trapped underground in Copiapó


Sandro Rojas Carrizo works on a letter before sending it down to his brother Esteban
Photograph: Natacha Pisarenko/AP
The Guardian

Chilean mineres trapped underground in Copiapó


Lilianett Gómez looks at the first letter sent by her father, Mario Gómez, from inside the mine
Photograph: Roberto Candia/AP
The Guardian

Chilean mineres trapped underground in Copiapó


Men work on a pipeline at the mine site. Food, clothes and antidepressants will be sent down to the trapped men
Photograph: Roberto Candia/AP
The Guardian

Chilean mineres trapped underground in Copiapó


Workers place a bottle of water inside a tube that links the trapped miners to the outside world
Photograph: Roberto Candia/AP
The Guardian

Chilean mineres trapped underground in Copiapó


The Xtrata 950 drill which will be used to make an escape route. The work could take till the end of the year
Photograph: Ivan Alvarado/Reuters
The Guardian

Chilean mineres trapped underground in Copiapó


team prepares the land where an escape hole will be drilled for the miners
Photograph: Ivan Alvarado/Reuters
The Guardian

Chilean miners trapped underground in Copiapó


A rescue bid is under way to reach 33 men trapped in a mine in Chile, but it could take months
Women light candles next to Chilean flags representing the 33 men trapped in the San José mine
Photograph: Natacha Pisarenko/AP
The Guardian

Thursday, August 26, 2010

Islands of Four Mountains


The picturesque, but snow-capped volcanoes, composing the Islands of the Four Mountains in Alaska's Aleutian Island chain look suspiciously like an alien world in this August 2010 image from the ASTER camera aboard NASA's orbiting Terra satellite.
The islands contain restless Mt. Cleveland, an active volcano currently being watched to see if it emits an ash cloud that could affect air travel over parts of North America. A close look at Mt. Cleveland, seen near the image center, shows red vegetation (false color), a white snow-covered peak, a light plume of gas and ash, and dark lanes where ash and debris fell or flowed. Millions of volcanoes have likely been active over the turbulent history of the Earth's surface, while about 20 volcanoes are erupting even today, at any given time.
Image Credit: NASA

Wednesday, August 25, 2010

32 presos mapuches están en huelga de hambre más de un mes. A la mayoría se les ha aplicado la Ley Antiterrorista por ataques incendiarios.




El padre Fernando Díaz, coordinador de la pastoral mapuche de la zona sur, considera que se trata de "un proceso donde se judicializa, se criminaliza la demanda mapuche, se la lleva simplemente como a un acto delictual sin querer afrontar el problema real que es la demanda y la reivindicación justa del pueblo mapuche, reconocida internacionalmente hoy en día por las Naciones Unidas", en declaraciones al diario La Tercera de Chile.

Víctor Ancalá, es el primer mapuche chileno al que se le aplicó la ley antiterrorista. Fue condenado a cinco años y un día de prisión por un acción violenta en que se quemaron varios vehículos. Cumplió su condena en una cárcel alta seguridad en la localidad de Concepción.
Ancalá estará el próximo 13 de septiembre en Ginebra, fecha en la que el gobierno chileno intervendrá para hablar sobre el Convenio 169 de la Organización Internacional del Trabajo, OIT, instrumento jurídico internacional que trata específicamente los derechos de los pueblos indígenas y tribales.

En esta entrevista realizada en los estudios de Radio Nederland Víctor Ancalá se refiere a su condena y a la lucha del pueblo Mapuche.


Artículos relacionados

Piñera vincula a mapuches con las FARC
Chile: investigan nexo entre indígenas mapuche y guerrilla de las FARC
Mapuches presos cumplen un mes de huelga de hambre en Chile
Mapuches en huelga de hambre son ignorados
Mapuches y sus tierras, un problema ancestral.
Los Mapuches: Camino a la autodeterminación

"Tornado de fuego" en Brasil




Un "tornado de fuego" causó caos y obligó a interrumpir el tráfico en la localidad deAraçatuba, en el estado de Sao Paulo, en Brasil.

El remolino fue el producto de incendios en el campo, combinados con muy bajos niveles de humedad luego de tres meses de sequía.

Hydrogen Sulfide and Dust Plumes on Namibia's Coast


Cloudless skies allowed a clear view of dust and hydrogen sulfide plumes along the coast of Namibia in early August 2010. The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this natural-color image on Aug. 10, 2010.
Multiple dust plumes blow off the coast toward the ocean, most or all of them probably arising from streambeds. Unlike the reddish-tan sands comprising the dunes directly south of the Kuiseb River, the stream-channel sediments are lighter in color. Wind frequently pushes dust plumes seaward along the Namibian Coast. Easterly trade winds blow from the Indian Ocean over the African continent, losing much of their moisture as they go. The winds are hot and dry as they pass over Namibia’s coastal plain, where they are prone to stir fine sediments.
Even with dust plumes overhead, the marked change in land cover is obvious along the Kuiseb River. South of the river, sand dunes predominate, but the vegetation along the Kuiseb River prevents the dunes from advancing northward. North of the river, the land surface consists primarily of gravel plains punctuated by rocky hills.
Hydrogen sulfide appears as a swath of irridescent green running parallel to the coast north of Walvis Bay. A 2009 study linked the emissions in this region to ocean currents, biological activity in the water column, and carbon-rich organic sediments under the water column. The meeting of hydrogen sulfide gas and oxygen-rich surface waters causes pure sulfur to precipitate into the water. The sulfur’s yellow color makes the water appear green to the satellite sensor.
Image Credit: NASA

Tuesday, August 24, 2010

Anaxagoras Crater


This image from the Lunar Reconnaissance Orbiter shows the floor of the moon's Anaxagoras crater, including a portion of the crater's anorthositic central uplift. The boulders perched on ridges are eroding out of densely fractured bedrock. This image was taken by the Lunar Reconnaissance Orbiter Camera, or LROC, which consists of a pair of narrow-angle cameras and a single wide-angle camera. The mission is expected to return over 70 terabytes of image data. Image Credit: NASA/GSFC/Arizona State University

Monday, August 23, 2010

MINEROS CHILENOS CANTAN HIMNO NACIONAL




Emocionante. Los mineros cantando la canción nacional desde 700 metros bajo tierra

Historia de un milagro: Miners make contact after 17 days underground


Chilean miners trapped underground in Copiapó have made contact 17 days after the mine in which they were working collapsed. Experts say it will take up to four months to dig them out
22 August 2010: TV grab taken from the Chilean National TV (TVN) of trapped miner Florencio Antonio Avalos Silva, during the first contact with a video camera after 17 days in San Esteban gold and copper mine, near Copiapó, in the Atacama desert, 480 miles north of Santiago
Photograph: -/AFP/Getty Images
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


22 August 2010: Chile's President Sebastián Piñera holds up a plastic bag containing a message from miners trapped in a collapsed mine, that reads in Spanish "All 33 of us are well inside the shelter" in Copiapó, Chile
Photograph: Hector Retamal/AP
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


17 August 2010: Chilean workers start a drilling machine outside the San Esteban gold and copper mine 12 days after the mine collapsed
Photograph: Ariel Marinkovic/AFP/Getty Images
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


17 August 2010: Chilean workers operate a drilling machine at the San Esteban gold and copper mine
Photograph: Ariel Marinkovic/AFP/Getty Images
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


17 August 2010: Relatives of trapped miners pray and light candles outside the San Esteban gold and copper mine
Photograph: Ariel Marinkovic/AFP/Getty Images
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


16 August 2010: Relatives of trapped miners gather at the entrance to the San Esteban gold and copper mine
Photograph: Ariel Marinkovic/AFP/Getty Images
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


16 August 2010: The camp installed outside the mine of San Jose, where relatives of the miners are staying
Photograph: Ian Salas/EPA
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


10 August 2010: Relatives and miners attend a mass outside the mine
Photograph: Luis Hidalgo/AP
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


10 August 2010: Miners carry an effigy of St Lorenzo, patron saint of miners, before a mass outside a collapsed mine where 33 miners are trapped in Copiapó, Chile
Photograph: Luis Hidalgo/AP
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


9 August 2010: Relatives place a Chilean flag at the collapsed mine
Photograph: Luis Hidalgo/AP
The Guardian

Historia de un milagro: Miners make contact after 17 days underground


7 August 2010: Co-workers, rescuers and relatives gather outside the mine
Photograph: Ivan Alvarado/Reuters
The Guardian

Historia de un milagro: Miners make contact after 17 days underground



Chilean miners trapped underground in Copiapó have made contact 17 days after the mine in which they were working collapsed. Experts say it will take up to four months to dig them out


6 August 2010: San Esteban gold and copper mine manager Pedro Simonovich speaks to relatives of miners outside the mine near the city of Copiapo, in the arid Atacama desert

Photograph: Martin Bernetti/AFP/Getty Images

Chile: Piñera lee el mensaje de los mineros




En un escueto mensaje, los 33 mineros que llevan atrapados 17 días en un yacimiento de Chile se comunicaron con el exterior.

El presidente del país, Sebastián Piñera, dio la noticia a las familias y mostró la nota, escrita en tinta roja, a los medios de comunicación.

Durante todo el día, las manifestaciones de alegría se sucedieron en el exterior de la mina.

Sunday, August 22, 2010

Chile: Rescatistas reciben mensajes a través de las sondas




Imágenes de un Video de Codelco que muestra el momento en que el Ministro Laurence Golborne junto al grupo de expertos en sondas reciben los mensajes de los mineros atrapados.

Emocionante recordar este momento

La Buena Noticia de este domingo



La Buena Noticia de este domingo


¡Un milagro!

Los mineros atrapados en Chile, a 700 metros de profundidad, hace 17 días siguen con vida

Saturday, August 21, 2010

Galactic Super-Volcano in Action


This image shows the eruption of a galactic “super-volcano” in the massive galaxy M87, as witnessed by NASA's Chandra X-ray Observatory and NSF's Very Large Array (VLA). At a distance of about 50 million light years, M87 is relatively close to Earth and lies at the center of the Virgo cluster, which contains thousands of galaxies. The cluster surrounding M87 is filled with hot gas glowing in X-ray light (and shown in blue) that is detected by Chandra. As this gas cools, it can fall toward the galaxy's center where it should continue to cool even faster and form new stars. However, radio observations with the VLA (red) suggest that in M87 jets of very energetic particles produced by the black hole interrupt this process. These jets lift up the relatively cool gas near the center of the galaxy and produce shock waves in the galaxy's atmosphere because of their supersonic speed. The interaction of this cosmic “eruption” with the galaxy's environment is very similar to that of the Eyjafjallajokull volcano in Iceland that occurred in 2010. With Eyjafjallajokull, pockets of hot gas blasted through the surface of the lava, generating shock waves that can be seen passing through the grey smoke of the volcano. This hot gas then rises up in the atmosphere, dragging the dark ash with it. This process can be seen in a movie of the Eyjafjallajokull volcano where the shock waves propagating in the smoke are followed by the rise of dark ash clouds into the atmosphere. In the analogy with Eyjafjallajokull, the energetic particles produced in the vicinity of the black hole rise through the X-ray emitting atmosphere of the cluster, lifting up the coolest gas near the center of M87 in their wake. This is similar to the hot volcanic gases drag up the clouds of dark ash. And just like the volcano here on Earth, shockwaves can be seen when the black hole pumps energetic particles into the cluster gas. The energetic particles, coolest gas and shockwaves are shown in a labeled version. Credits: X-ray: NASA/CXC/KIPAC/N. Werner et al Radio: NSF/NRAO/AUI/W. Cotton

Iran opens first nuclear power plant


Sergei Kiriyenko (second from left), head of the Russian state nuclear energy corporation Rosatom, shakes hands with Ali-Akbar Salehi, chief of Iran's Atomic Energy Organisation
Photograph: Raheb Homavandi/Reuters
The Guardian

Iran opens first nuclear power plant


Iranian women security officials of the Bushehr nuclear plant observe the media
Photograph: Abedin Taherkenareh/EPA
Thr Guardian

Iran opens first nuclear power plant


The model of Iran's Bushehr nuclear power plant is displayed during a ceremony initiating the transfer of Russia-supplied fuel to the facility in the southern port
Photograph: Atta Kenare/AFP
The Guardian

Iran opens first nuclear power plant


An image grab taken from footage broadcast by Iran's state-run Arabic-language Al-Alam TV shows officials and engineers during the launching of the Russian-built first nuclear power plant in Iran
The Guardian

Iran opens first nuclear power plant


Photographers and cameramen take pictures of the reactor in construction at the Russian-built Bushehr nuclear power
Photograph: Atta Kenare/AFP
The Guardian

Iran opens first nuclear power plant


Iranian and Russian engineers and officials attend a ceremony to celebrate the loading of fuel into Iran's first nuclear power plant
A security official watches journalists during a tour of the nuclear power plant in Bushehr as Iran began fuelling its first nuclear power plant, a potent symbol of its rejection of international sanctions designed to prevent it building a nuclear bomb
Photograph: Raheb Homavandi/Reuters
The Guardian

Friday, August 20, 2010

M 87


Massive Attack

This image shows the eruption of a galactic “super-volcano” in the massive galaxy M87, as witnessed by NASA's Chandra X-ray Observatory and NSF's Very Large Array (VLA). At a distance of about 50 million light years, M87 is relatively close to Earth and lies at the center of the Virgo cluster, which contains thousands of galaxies.
The cluster surrounding M87 is filled with hot gas glowing in X-ray light (and shown in blue) that is detected by Chandra. As this gas cools, it can fall toward the galaxy's center where it should continue to cool even faster and form new stars.
However, radio observations with the VLA (red) suggest that in M87 jets of very energetic particles produced by the black hole interrupt this process. These jets lift up the relatively cool gas near the center of the galaxy and produce shock waves in the galaxy's atmosphere because of their supersonic speed. The interaction of this cosmic “eruption” with the galaxy's environment is very similar to that of the Eyjafjallajokull volcano in Iceland that occurred in 2010. With Eyjafjallajokull, pockets of hot gas blasted through the surface of the lava, generating shock waves that can be seen passing through the grey smoke of the volcano. This hot gas then rises up in the atmosphere, dragging the dark ash with it. This process can be seen in a movie of the Eyjafjallajokull volcano where the shock waves propagating in the smoke are followed by the rise of dark ash clouds into the atmosphere.
In the analogy with Eyjafjallajokull, the energetic particles produced in the vicinity of the black hole rise through the X-ray emitting atmosphere of the cluster, lifting up the coolest gas near the center of M87 in their wake. This is similar to the hot volcanic gases drag up the clouds of dark ash. And just like the volcano here on Earth, shockwaves can be seen when the black hole pumps energetic particles into the cluster gas.
Image Credits: X-ray: NASA/CXC/KIPAC/N. Werner et al Radio: NSF/NRAO/AUI/W. Cotton

Beautiful


National Geografic

Emergencia en Pakustán


Bachel, Pakistan: Wind from a Pakistan navy helicopter blows furniture into the water as a man waits for emergency aid on the roof of a house surrounded by floodwaters in Sindh province
Photograph: Kevin Frayer/AP

Thursday, August 19, 2010

Inundaciones en Pakistán afectan a mujeres embarazadas




Las peores inundaciones que ha tenido Pakistán en su historia han afectado a unos 20 millones de personas, según cálculos gubernamentales.

Un sector especialmente vulnerable son las mujeres embarazadas, quienes se han quedado sin ayuda ginecológica ni infraestructura.

La ONU pide un "apoyo masivo" para Pakistán




Las inundaciones en Pakistán han dejado entre 15 y 20 millones de afectados, según los cálculos de Naciones Unidas.

El secretario general de la ONU, Ban Ki-moon, calificó la crisis humanitaria como "un tsunami en cámara lenta".

En este video de BBC Mundo le mostramos la intervención del alto funcionario, que dijo que es necesario un "apoyo masivo" de la comunidad internacional para ese país.

Inundaciones en Pakistán



Sangi, Paksitan: A Pakistani flood survivor hangs onto a hovercraft and appeals for relief food distributed by naval officials


Photograph: Shakil Adil/AP

Llegaron a Bucarest los primeros gitanos deportados por Francia

Wednesday, August 18, 2010

NASA: Into the Night



Researchers do not yet know what is lighting up IRAS 05437+2502, a small, faint nebula that spans only 1/18th of a full moon toward the constellation of the Taurus. Particularly enigmatic is the bright upside-down V that defines the upper edge of this floating mountain of interstellar dust.


This ghost-like nebula involves a small star-forming region filled with dark dust that was first noted in images taken by the IRAS satellite in infrared light in 1983. This recently released image from the Hubble Space Telescope shows many new details, but has not uncovered a clear cause of the bright sharp arc.


Image Credit: NASA, ESA, Hubble, R. Sahai (JPL)

Tuesday, August 17, 2010

Independencia de Indonesia


Mujeres de la fuerza naval de Indonesia forman file homenajeando el día de la Independencia de ese país
La Nación

Surfista



Un surfista australiano compite en un torneo de la especialidad en Tahiti (Reuters)


La Nación

Sunday, August 15, 2010

Masivo deslizamiento de tierra en China

"Me niego a bajar los brazos"


Charles Aznavour ha cumplido 86 años y sigue subiéndose a los escenarios para contentar a sus fans; el cantante, que musicó sus duros inicios en la chanson en 'Je me voyais déjà', se niega a jubilarse
La Vanguardia

Glaciares en retroceso



Iceberg frente a un glaciar en Kongsfjorden, cerca de Ny-Alesund, en el oeste de Spitsbergen, la mayor de las islas Svalbard (Noruega)


La vanguardia

Friday, August 13, 2010

Charity: water

These kids used to drink this water behind them — until a charity: water well was built in the their village.
In less than four years, charity: water has brought clean and safe drinking water to 30,713 people in India and more than a million elsewhere in the developing world.
$20 can give one person, like this girl, clean water for 20 years. Learn more here.

NASA: Testing for the future


Testing for the Future

Testing advanced designs for high-speed aircraft in 1948, an engineer makes final calibrations to a model mounted in the 6 x 6 Foot Supersonic Wind Tunnel at the NACA Ames Aeronautical Laboratory, Moffett Field, California. NACA, NASA’s predecessor organization the National Advisory Committee for Aeronautics, was established in March 1913 by Congress to "supervise and direct the scientific study of the problems of flight, with a view to their practical solutions." The Ames Aeronautical Laboratory is now NASA’s Ames Research Center.
Image Credit: NASA

Perseid meteor shower puts on a spectacular show


A meteor enters the earth's atmosphere in this long exposure picture taken on a mountain road south of Macedonia's capital Skopje
Photograph: Boris Grdanoski/AP
The Guardian