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Zolensky, Michael E. and Grady, Monica M.
(2018).
DOI: https://doi.org/10.2138/gselements.14.2.83
Abstract
We introduce the principal mysteries surrounding comets; discuss the proposed importance of comets to the origin of water and organic compounds in the inner solar system; and summarize the history of cometary observation, study, and exploration over the past 22 centuries.