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In this April 26, 2019 photo Molly McCanta, a University of Tennessee-Knoxville professor, looks through a microscope. She will participate in a NASA research program that will examine samples from the moon that have been completely sealed since they were collected in 1972. (Monica Kast/Knoxville News Sentinel via AP)

In this April 26, 2019 photo Molly McCanta, a University of Tennessee-Knoxville professor, looks through a microscope. She will participate in a NASA research program that will examine samples from the moon that have been completely sealed since they were collected in 1972. (Monica Kast/Knoxville News Sentinel via AP)

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