Noticies dijous 26 d'abril

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Hui: Ocean Currents Causing Antarctic Ice Loss This animation shows the circulation of ocean currents around the western Antarctic ice shelves. The shelves are indicated by the rainbow color; red is thicker (>550m), while blue is thinner (<200m). These shelves are being melted from the underside by warm ocean currents. El hielo de la Antártida pierde siete metros cada año por el calentamiento de los océanos; Los indígenas awá, al borde de la aniquilación en Brasil; Mèxic: El fuego amenaza al pulmón de Guadalajara; Estados Unidos reduce la contaminación atmosférica; Primer detenido por el vertido de crudo al Golfo de México; Canàries: Las prospecciones de petróleo se prevén a 13 kilómetros de zonas de especial conservación; ¿Ciclogénesis explosiva o bomba meteorológica?; Las aves con plumaje rojizo o naranja tienen más problemas visuales; Una exposición en París revela la "vida social" de las plantas tropicales; El MIT lanza la segunda edición de los premios TR35 en España; La tormenta de asteroides que cambió la Tierra; Descubren en Madrid el banquete de mamut de unos neandertales; Vietnam: La extraña enfermedad que deja perplejos a los expertos; Pedro Alonso: “Me temo que no veré la erradicación de la malaria”; Un compuesto reduce los comportamientos autistas en ratones; Nuevo caso de ‘vaca loca’ en Estados Unidos; Una aplicación para iPhone y Android ayuda a prevenir la meningitis; Las mujeres tienen las pupilas más grandes que los hombres; i Un 'jugador extra' en el campo. Vesta Shape and Gravity This video from NASA's Dawn mission shows that the gravity field of Vesta closely matches the surface topography of the giant asteroid Vesta. The video shows shaded topography from Dawn's framing camera on the left, with troughs and craters visible, and color-contoured data from Dawn's gravity experiment on the right. Red shows the areas with a higher than average gravity field and blue-purple shows the areas where the field is weaker on average. The highest topography, on the rim of the Rheasilvia basin ... › Show More This video from NASA's Dawn mission shows that the gravity field of Vesta closely matches the surface topography of the giant asteroid Vesta. The video shows shaded topography from Dawn's framing camera on the left, with troughs and craters visible, and color-contoured data from Dawn's gravity experiment on the right. Red shows the areas with a higher than average gravity field and blue-purple shows the areas where the field is weaker on average. The highest topography, on the rim of the Rheasilvia basin deep in the southern hemisphere, shows a particularly strong gravity field. The topography model is derived from framing camera images from Dawn's high-altitude mapping orbit (420 miles or 680 kilometers above the surface), and the gravity data come from the low-altitude mapping orbit (130 miles or 210 kilometers above the surface). Vesta takes approximately 5.34 hours to make a rotation. This video from NASA's Dawn mission shows that the gravity field of Vesta closely matches the surface topography of the giant asteroid Vesta. The video shows shaded topography from Dawn's framing camera on the left, with troughs and craters visible, and color-contoured data from Dawn's gravity experiment on the right. Red shows the areas with a higher than average gravity field and blue-purple shows the areas where the field is weaker on average. The highest topography, on the rim of the Rheasilvia basin deep in the southern hemisphere, shows a particularly strong gravity field. The topography model is derived from framing camera images from Dawn's high-altitude mapping orbit (420 miles or 680 kilometers above the surface), and the gravity data come from the low-altitude mapping orbit (130 miles or 210 kilometers above the surface). Vesta takes approximately 5.34 hours to make a rotation. Inside the Russian Soyuz Spacecraft In this episode of NASA: Behind the Scenes, take a tour inside the Russian Soyuz, the vehicle which takes the expedition crews back and forth to the International Space Station. Astronaut Mike Fincke, a veteran of the Soyuz and shuttle, shows off the features of the vehicles and talks about what it’s like to be inside.