I share gladly this astonishing image of a recent Solar Flare.
Image Credit: NASA/SDO.
On Feb. 24, 2014, the sun emitted a significant solar flare, peaking at 7:49 p.m. EST. NASA's Solar Dynamics Observatory (SDO), which keeps a constant watch on the sun, captured images of the event. These SDO images from 7:25 p.m. EST on Feb. 24 show the first moments of this X-class flare in different wavelengths of light -- seen as the bright spot that appears on the left limb of the sun. Hot solar material can be seen hovering above the active region in the sun's atmosphere, the corona.
Solar flares are powerful bursts of radiation, appearing as giant flashes of light in the SDO images. Harmful radiation from a flare cannot pass through Earth's atmosphere to physically affect humans on the ground, however -- when intense enough -- they can disturb the atmosphere in the layer where GPS and communications signals travel.
#solar_flare #SDO #NASA #space #astronomy #science #ScienceSunday
Cool and icy Dione floats in front of giant Saturn bedecked in a dazzling array of colors.
The surface of Dione, which exhibits contrasting bright and dark areas when viewed up close, appears pale in this image. It is Saturn's multi-hued cloud bands that boldly steal the show. Discrete clouds and eddies in Saturn's northern hemisphere can be seen within the faint shadows of the rings on the planet. Dione is 1,118 kilometers (695 miles) across.
This view was obtained from about one-third of a degree out of the ring plane.
Images taken with red, green and blue filters were used to create this natural-color view. The images were obtained with the wide-angle camera on Sept. 22, 2005, from a distance of approximately 803,000 kilometers (499,000 miles) from Dione and at a sun-Dione-spacecraft, or phase, angle of about 43 degrees. The image scale is about 48 kilometers (30 miles) per pixel.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.
Credit: NASA/JPL/Space Science Institute
#NASA #Saturn #Dione #Moon #Rings #Cassini #ESA
When you take a look at Mars, you probably wouldn't think that it looks like a nice place to live. It's dry, it's dusty, and there's practically no atmosphere. But some scientists think that Mars may have once looked like a much nicer place to live, with a thicker atmosphere, cloudy skies, and possibly even liquid water flowing over the surface. So how did Mars transform from a warm, wet world to a cold, barren desert? NASA's MAVEN spacecraft will give us a clearer idea of how Mars lost its atmosphere (and thus its water), and scientists think that several processes have had an impact.
Scientists think that the collision of neutral hydrogen molecules may have helped to drive the Martian atmosphere into space over billions of years.
Credit: NASA, NASA Goddard, JPL
#NASA #Mars #Atmosphere #MAVEN #Science
Image Credit: NASA/Solar Dynamics Observatory
#sdo #sun #solar #solarsystem #nasa #science #coronal
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