A:
Astrobiology Magazine - Information and discussion groups devoted to Extrasolar life; Extreme life; Life and Giant Planets; Mars Life; Meteors, Comets, and Asteroids; Missions; New Planets; Stellar Evolution; Terrestrial Climate History; Terrestrial Origins. [National Aeronautics and Space Administration (NASA), Ames Research Center (ARC)]

N:
NTRS (NASA Technical Reports Server) - Search for reports, journal articles, and conference proceedings [National Aeronautics and Space Administration (NASA)]

Near-Earth Object Program - Brings together relevant information on all aspects of comet and asteroid studies [National Aeronautics and Space Administration (NASA), Jet Propulsion Laboratory (JPL)]