Sunset Over South America
The Expedition 27 crew photographed this sunset over western South America from aboard the International Space Station. The station crew sees, on average, sixteen sunrises and sunsets during a 24-hour orbital period. Each changeover between day and night on the ground is marked by the terminator, or line separating the sunlit side of Earth from the side in darkness. While the terminator is conceptualized as a hard boundary--and is frequently presented as such in graphics and visualizations--in reality the boundary between light and dark is diffuse due to scattering of light by Earth’s atmosphere.
This zone of diffuse lighting is experienced as dusk or twilight on the ground--while the sun is no longer visible, some illumination is still present due to light scattering over the local horizon. The terminator is visible in this photograph trending across the image from lower left to upper right. This panoramic view across central South America, looking towards the northeast, was acquired at approximately 7:37 p.m. local time. Layers of Earth’s atmosphere, colored bright white to deep blue, are visible extending across the horizon. The highest cloud tops have a reddish glow from the direct light of the setting sun while lower clouds are in twilight. The Salar de Coipasa, a large salt lake in Bolivia, is dimly visible on the night side of the terminator. The salar provides a geographic reference point that allows the location and viewing orientation of the image to be determined.
Image Credit: NASA
Full-Size Image | 4,256 x 2,913 pixels @ 24 bits per pixel | 294 KB
http://www.nasa.gov/images/content/542391main_iss027e012224_full.jpg
A Star-Formation Laboratory
The dwarf galaxy NGC 4214 is ablaze with young stars and gas clouds. Located around 10 million light-years away in the constellation of Canes Venatici (The Hunting Dogs), the galaxy's close proximity, combined with the wide variety of evolutionary stages among the stars, make it an ideal laboratory to research the triggers of star formation and evolution. This color image was taken using the Hubble Space Telescope's Wide Field Camera 3 in December 2009.
Image Credit: NASA/ESA/Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration
Full-Size Image | 1,280 x 954 pixels @ 24 bits per pixel | 324 KB
http://www.nasa.gov/images/content/544961main_hubble_may12_full_full.jpg
Lightning Over Brazil
The European Space Agency's Paolo Nespoli took this image of lightning over Brazil as seen from the International Space Station in January 2011. Nespoli, a member of the Expedition 27 crew, first visited the station in 2007 as a member of the STS-120 crew aboard space shuttle Discovery to deliver the Italian-built Harmony node.
Image Credit: ESA/NASA
Full-Size Image | 1,600 x 1,062 pixels @ 24 bits per pixel | 470 KB
http://www.nasa.gov/images/content/545422main_lightning_full.jpg
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