This is a $480,655.00 grant for research awarded by the National Aeronautics and Space Administration (NASA) to the Southwest Research Institute (SwRI), a nonprofit research organization based in San Antonio, Texas. The research aims to develop a comprehensive model of planetesimal bombardment during the Hadean Eon (approximately 3.9-4.5 billion years ago) and its environmental effects, with a focus on factors affecting life and habitability. The research will utilize numerical simulations and terrestrial constraints to calibrate the Hadean bombardment flux, and then study the near-surface thermal effects of the impacts, as well as their effects on crustal recycling. The ultimate goal is to make predictions on the fraction of the Earth's near-surface volume capable of sustaining liquid water and habitable environments throughout the Hadean. This research is relevant to NASA's Exobiology and Astrobiology Roadmap programs. The contract is not set aside and has a completion date of March 19, 2019.