Apr 23 1999
From The Space Library
Space News for this day. (5MB PDF)
Scientists Peter Smith of the University of Arizona and Justin Maki of NASA's Jet Propulsion Laboratory published a report in the Journal of Geophysical Research summarizing the results of the Mars Pathfinder Mission. After an exhaustive review of more than 17,000 images from the Pathfinder's 1997 mission, the report had concluded that Mars's air and dirt are yellowish-brown in color, not red. Viking probes of the 1970s had likewise indicated that Mars is not red, but rather yellowish-brown. However, Mars appears red to the naked eye from Earth, and the Hubble Space Telescope (HST) data had indicated that Mars is red. The scientists reported that the detailed analysis using Pathfinder data had revealed that the HST, not Pathfinder, needed to be recalibrated.
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