NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
False-colour image of asteroid 951 Gaspra, taken by the Galileo spacecraft on 29 October 1991 at a distance of 16,200km. Three images, taken through violet, green and infrared filters, have been processed to give an approximation to true colour. Gaspra is approximately 19km x12kmx11km in size and orbits the Sun at the inner edge of the main asteroid belt between Mars and Jupiter. In this image, an area of about 16kmx12km is lit, the sunlight coming from the right. The surface shows many craters, two large facets are visible at the limb at the top and lower right, both about 8km across. The smallest craters visible are about 300m across.
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