El acelerador de partículas circular Tevatrón, el equivalente americano del Gran Colisionador de Hadrones (LHC) del Centro Europeo de Investigación Nuclear (CERN), cierra sus puertas este viernes por falta de financiación, un hecho que los medios de comunicación de Estados Unidos definen con “el fin de la era de los grandes físicos estadounidenses”. El Tevatrón, [...]
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Composite of a Series of Images Taken From Space Aboard the Space Station
This is a composite of a series of images photographed from a mounted camera on the Earth-orbiting International Space Station, from approximately 240 miles above Earth. Expedition 31 Flight Engineer Don Pettit said of the about photographic techniques used to achieve the images: "My star trail images are made by taking a time exposure of about 10 to 15 minutes. However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image. To achieve the longer exposures I do what many amateur astronomers do. I take multiple 30-second exposures, then ‘stack’ them using imaging software, thus producing the longer exposure." A total of 18 images photographed by the astronaut-monitored stationary camera were combined to create this composite. Image Credit: NASA
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