An image combining orbital imagery with 3-D modeling shows flows that appear in spring and summer on a slope inside Mars' Newton crater. Image credit: NASA/JPL-Caltech/Univ. of Arizona › Full image and caption › Image gallery › Related video This series of images shows warm-season features that might be evidence of salty liquid water active on Mars today. Image credit: NASA/JPL-Caltech/Univ. of Ar
Report of the PRESIDENTIAL COMMISSION on the Space Shuttle Challenger Accident Introduction [F1] It appears that there are enormous differences of opinion as to the probability of a failure with loss of vehicle and of human life. The estimates range from roughly 1 in 100 to 1 in 100,000. The higher figures come from the working engineers, and the very low figures from management. What are the caus
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