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Ricardo Daniel González
Works at Notaspampeanas
Attended Instituto Domingo Savio
Lives in Santa Rosa, La Pampa
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This #PaleRedDot discovery of Proxima b will be the beginning of extensive further observations, both with current instruments and with the next generation of giant telescopes such as the European Extremely Large Telescope, the #BiggestEyeOnTheSky Image credit: @ESOastronomy /L. Calçada/ACe Consortium
Full story here: http://socsi.in/yqC5U
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Artist's impression of relative sizes of the Alpha Centauri components and other objects #PaleRedDot
Image credit: @ESOAstronomy
Full story here: http://socsi.in/7p1sq
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Ice Scours the North Caspian Sea

In early April 2016, ocean scientist Norman Kuring of NASA’s Goddard Space Flight Center found a puzzling image that showed lines crisscrossing the North Caspian Sea. On its own, the image was strikingly beautiful. Shallow waters surrounding the Tyuleniy Archipelago allow you to see the dark green vegetation on the sea bottom. But the question remained: what caused those lines?

The Operational Land Imager (OLI) on the Landsat 8 satellite acquired this natural-color image of the curious scour marks on April 16, 2016.

The dark green areas—possibly sea grass or benthic algae—and the lines are features of the sea bottom. “You can tell this by the fact that marks laid down in January have not moved by April,” Kuring said. “If those were water features, they would not persist through one tidal cycle.”

It’s possible that some of the marks have a human origin. Similar lines show up in the world’s oceans because of trawling. But the scientific literature and the January satellite image suggest that a majority of the marks in the images above were gouged by ice.

Stanislav Ogorodov, a scientist at Lomonosov Moscow State University who has published research on the phenomenon, agrees: “Undoubtedly, most of these tracks are the result of ice gouging.” Ogorodov notes that this part of the Caspian is very shallow—about 3 meters deep. Ice that forms here in wintertime is usually about 0.5 meters thick, so most of it never touches the seafloor. But the ice tends to be “warm” and thin, which gives rise to relatively weak ice cover that is easily deformed by wind and currents. When pieces of ice are pushed together, some ice is forced upward and downward into so-called “hummocks.” The keels of hummocks, frozen into the ice fields, can reach the seafloor and scour the bed as the ice moves.

http://go.nasa.gov/1NpfglS
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Are you having trouble keeping track of all the planets in the Solar System? Good news! Astronomers have found evidence that there’s another huge planet far out in the Solar System. Textbooks will need to be rewritten again. You’re welcome.
Are you having trouble keeping track of all the planets in the Solar System? Good news! Astronomers have found evidence that there’s another huge planet far out in the Solar System. Textbooks will need to be rewritten again. You’re welcome.
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DLR at the Hannover Trade Fair: Intelligent wind turbines, efficient energy storage and 40 years of energy research

Using their knowledge and expertise in the field of aviation, researchers from #DLR have developed innovative ideas for wind turbine rotors. During the +Hannover Messe, which will take place from 25 to 29 April 2016, they will demonstrate how their intelligent rotor blades adapt to #wind loads. DLR is also focusing on #energy storage which is increasingly making use of renewable energy sources. DLR researchers are developing storage solutions for industrial use. These solutions could enable large amounts of energy to be stored in the form of heat. These new thermal energy storage systems will be presented at the Trade Fair.

In addition, DLR is celebrating its 40th anniversary of #energyresearch and is taking a look back at its successes and achievements in this field: http://www.dlr.de/40Years

Full article: http://www.dlr.de/dlr/en/desktopdefault.aspx/tabid-10081/151_read-17536/year-all/#/gallery/22752


Image: DLR researchers develop various storage solutions for industrial applications, where large amounts of energy can be stored in the form of heat. Credit: DLR (CC-BY 3.0).
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#ESOjobs People interested to work at the La Silla Paranal Observatory are invited to apply for an Executive Bilingual Secretary position. The deadline for applications is 2 May 2016. Details at http://socsi.in/tVnaJ
Follow our LinkedIn page to stay up to date with career opportunities at ESO: http://socsi.in/5UKt9
Image credit: @yuribeletskyphoto / @ESOAstronomy
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“Donde hubo juego, ideas quedan”

Te invitamos a Juevex! organizado por Tedex Córdoba
Donde uno de los oradores será el Director del Observatorio Astronómico de Córdoba, Diego García Lambas!

¡Estos son los oradores del próximo #Juevex!

Enrique Orschanski, Gonzalo Marull, Diego García Lambas, Melania Ottaviano y Hecatombe! se animan a asombrarse y divertirse junto a nosotros.

¡Te invitamos a sumarte al juego! Podés inscribirte acá gratuitamente : https://goo.gl/iyUZsc

Nos vemos el próximo jueves 25 de agosto a las 18:30 en la Sala Mayor de la Ciudad de las Artes.

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¿POR QUÉ EL MERIDIANO DE GREENWICH ESTÁ CORRIDO?

En 1884, la Conferencia Internacional del Meridiano recomendó que el primer meridiano de la Tierra, que se utilizaría como un "cero común de longitud y estándar de tiempo en todo el mundo" pasara por el centro del instrumento de tránsito en el Observatorio de Greenwich.

Este instrumento, el llamado Círculo de Tránsito de Airy, por su diseñador, el astrónomo real británico Sir George Biddell Airy, es un dispositivo telescópico del siglo XIX para medir la posición de las estrellas, y podía ser utilizado para determinar la hora local.

Sin embargo, hoy en día, los turistas que visitan la línea del meridiano, deben caminar hacia el este aproximadamente 102 metros antes de que sus receptores de navegación por satélite indiquen la longitud cero.

¿Por qué? Debido a nuevas tecnologías, sobre todo la excelente precisión del GPS, que utiliza los satélites para medir con exactitud las coordenadas en cualquier punto de la superficie de la Tierra, que sustituyeron las observaciones telescópicas tradicionales que se utilizaba para medir la rotación de la Tierra.

El Dr Seidelmann, de la Universidad de Virginia, y los co-autores del estudio, concluyeron que una ligera desviación en la dirección natural de la gravedad en Greenwich es la responsable de la desviación, junto con el mantenimiento de la continuidad del tiempo astronómico.

Según el equipo, el desplazamiento de 102 metros puede ser atribuida a la diferencia entre los dos métodos convencionales para determinar coordenadas: astronómico vs. geodésica, que hace referencia a un conjunto de puntos de referencia utilizados para localizar lugares de la Tierra.

Su diferencia se conoce como "desviación de la vertical, 'y los modelos gravitacionales globalesde de alta resolución confirman que el componente este-oeste de esta desviación es del signo y la magnitud apropiada en Greenwich para dar cuenta de todo el corrimiento.

Debido a que nuestro planeta no es perfectamente redondo, y que los diferentes lugares de la Tierra tienen diferentes características en el terreno que afectan a la fuerza de gravedad, las formas tradicionales para medir la longitud han incorporado variaciones, o errores, basado en la ubicación específica en la que se toman mediciones.

Las observaciones se basan en una determinada vertical desde una cuenca de mercurio y dependían de las condiciones locales. "Sin embargo, el GPS mide verticales desde el espacio en línea recta directamente a través del centro de la Tierra, eliminando de forma eficaz los efectos gravitacionales de montañas y otros terrenos," explicó el Dr. Seidelmann.

Para las pruebas correspondientes, los científicos también analizaron las diferencias en las coordenadas de muchos observatorios antiguos encargados de proveer la hora para afirmar que el cambio de la longitud aparente de Greenwich es un efecto localizado debido a la dirección de la gravedad en Greenwich, y no un cambio global en el sistema de la longitud del mundo.

Fuente: Breaking Science News at Sci-News.com
Créditos de imagen: Google Maps / Infoterra Ltd. / Bluesky

‪#‎NoticiasOAC‬ ‪#‎Greenwich‬ ‪#‎meridiano‬ ‪#‎MeridianoDeGreenwich‬
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+Beth Beck compartió la información de #SpaceAppsPAS, y en la imagen vemos a @astrowheels
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"Women in Data Boot Camp" sets the stage for innovation at the start of NASA 2016 International Space Apps Challenge.
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From the windows on the International Space Station, our eighth collaboration with IMAX came to life for 'A Beautiful Planet.' Details: http://go.nasa.gov/1MNTVlY #EarthDay
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Using Clouds to Map Life

Clouds may seem like distant, ephemeral features that have little to do with life on Earth. In fact, they affect everything from the viability of ecosystems, to how much carbon plants absorb, to the reproductive success of reptiles. So by mapping clouds, new research shows, scientists can indirectly map life.

Adam Wilson compiled a global database of cloud cover while he was a postdoctoral researcher at Yale University. The database includes 15 years of satellite observations captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors on NASA’s Aqua and Terra satellites. Each day, the satellites acquire images of most of Earth’s surface, though clouds obscure the view more often than not in many parts of the world.

By combining all of the cloud observations from 2000 and 2014, Wilson (now at the University at Buffalo) and Yale colleague Walter Jetz generated a comprehensive global cloud climatology that reveals the distribution and seasonality of clouds. Using this new cloud database, NASA Earth Observatory generated maps of cloud seasonality and timing.

The top map shows where cloud cover tends to be consistent throughout the year (white) and where it varies depending on the season (dark blue). Notice that much of India, southern Africa, and northern Australia experience vast swings in cloudiness throughout the year. The bottom map shows the timing of peak cloudiness within a given year.

Cloud seasonality can have a crucial impact on ecosystems on the ground, so the new cloud atlas will be useful for mapping the boundaries of ecosystems. While tropical and subtropical forests thrive with steady cloud cover, tropical and subtropical savannas in Africa scrubland and in northern Australia have adapted to dramatic variations in cloudiness (and rainfall) by season.

Some of the most continuously cloudy areas—the Andes, the Congo River Basin, Indonesia, Borneo, and New Guinea—are home to cloud forests, unique high-elevation ecosystems known for harboring remarkable biodiversity. To highlight how their new cloud climatology can be useful to ecologists, Wilson and Jetz modeled the distribution of a songbird (the montane woodcreeeper) often found in cloud forests and a flowering plant from a semi-arid ecosystem of South Africa (king protea). They concluded that the new cloud climatology offers a better tool for predicting the geographic range of the two species than analysis of temperature and precipitation patterns, the standard method for predicting species range.

“We hope to see this data spread far and wide among policymakers and others involved in spatial planning and resource management,” noted Jetz. “We are already in the process of integrating this cloud data into biodiversity predictions offered as part of the Map of Life project.”

http://go.nasa.gov/1WKkxXa
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Onda Solare is an Italian team which is going to compete at @CarreraSolar Atacama with a solar car.
On their way to North of Chile, the team stopped at our #LaSilla Observatory to see our power plant. http://socsi.in/PrSx1
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Education
  • Instituto Domingo Savio
    1966 - 1978
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Ricardo Daniel González García Fuertes Sulleiro
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Ni una sola hoja cae sin sentido
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Periodista científico
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  • Notaspampeanas
    Director, present
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