SpacecraftCosmic DustMeteoroidsExtraterrestrial EnvironmentJupiterSpace FlightEcological Systems, ClosedMarsUnited States National Aeronautics and Space AdministrationSaturnStars, CelestialSpace SimulationMoonNucleoside-Phosphate KinaseEnvironment, ControlledIceSolar SystemGuanylate KinaseCosmic RadiationAtmosphereEnvironmental MicrobiologyWeightlessnessTight Junction ProteinsVolcanic EruptionsAstronautsNeonBacillusSpores, BacterialMicrococcusPhotoreceptor Cells, InvertebrateFungiGravitationCell PolarityCorynebacterium