JA Grier
JA Grier (born 1968) is an American planetary scientist who works as a senior scientist and senior education and communication specialist at the Planetary Science Institute. Grier's research has focused on the weathering of planets, moons, and asteroids, the age of impact ejecta on the lunar soil, the chemical composition of meteorites, and the existence of water on Mars. They are also active in science education. Provided by Wikipedia-
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