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Dark matter may occasionally interact with minerals in the earth, leaving telltale tracks that physicists hope to decipher.
Planetary geologist Meenakshi Wadhwa uses Martian meteorites to trace the history of our solar system.
Evidence for life in 3.7-billion-year-old rocks appears to be crumbling away.
A series of fossil finds suggests that life on Earth started earlier than anyone thought, calling into question a widely held theory of the solar system’s beginnings.
Jason Morgan developed the theory of plate tectonics in 1967 while working among a critical mass of talented geophysicists at Princeton University.