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By Charles Elachi, Jakob J. van Zyl. CHARLES ELACHI, PHD, is a Professor of electrical engineering and planetary science at Caltech. He was the Director of NASA's Jet Propulsion Laboratory from 2001 to 2016.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.