Satellites record data in different parts of the light spectrum that we can't see. And it's that information that allows satellites to be so powerful in terms of looking at things like vegetation health, finding different kinds of geology that may indicate an oil deposit or some kind of mineralogical deposit that can be mined.

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About Sarah Parcak

Sarah Parcak was American archaeologist. Sarah Helen Parcak is an American archaeologist and Egyptologist, who has used satellite imagery to identify potential archaeological sites in Egypt, Rome, and elsewhere in the former Roman Empire. She is a professor of Anthropology and director of the Laboratory for Global Observation at the University of Alabama at Birmingham. Read more on Wikipedia →

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