NASA. MARS PLANET. On May 19, 2005, NASA's Mars Exploration - Lot 261

Lot 261
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NASA. MARS PLANET. On May 19, 2005, NASA's Mars Exploration - Lot 261
NASA. MARS PLANET. On May 19, 2005, NASA's Mars Exploration Rover Spirit captured this striking view as the Sun sank below the rim of Gusev Crater on Mars. This panoramic camera (Pancam) mosaic was taken at around 6:07 pm on the evening of the rover's 489th Martian day, or sol. Spirit was instructed to stay awake briefly after sending data from this sol to the Mars Odyssey orbiter just before sunset. This small panorama of the western sky was obtained using Pancam's 750 nanometer, 530 nanometer and 430 nanometer color filters. This combination of filters generates false-color images that are similar to what a human being would see, but with slightly exaggerated colors. In this image, the bluish glow in the sky above the Sun would be visible to us if we were there, but an artifact of Pancam's infrared imaging capabilities is that with this filter combination, the redness of the sky further from sunset is exaggerated compared to the daytime colors of the Martian sky. As Mars is further from the Sun than the Earth, the Sun only appears at two-thirds its size in a sunset seen from Earth. The terrain in the foreground is the rocky outcrop "Jibsheet", a feature Spirit has been studying for several weeks (the rover's tracks are faintly visible as far as "Jibsheet"). The floor of the Gusev crater is visible in the distance, and the Sun sets behind the Gusev wall some 80 km away.This mosaic is another MER example of a beautiful, sublime Martian scene that also captures important scientific information. Specifically, the sunset and twilight images are occasionally acquired by the science team to determine how high up in the atmosphere the Martian dust extends, and to search for dust or ice clouds. Other images have shown that the twilight glow remains visible, but increasingly faint, for up to two hours before sunrise or after sunset. The length of Martian twilight (compared with Earth's) is due to the scattering of sunlight on the planet's night side by abundant high-altitude dust. Similar long twilights or extra-colored sunrises and sunsets sometimes occur on Earth, when tiny grains of dust ejected by powerful volcanoes scatter the light in the upper layers of the atmosphere.Vintage chromogenic print. Numbering on front. Legend on back label. 20.4 x 25.4cm with margins.
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