AstronautsIntracranial PressureSpace FlightIntracranial HypertensionWeightlessnessCosmic RadiationSpace SuitsSpace SimulationAerospace MedicineWeightlessness SimulationPressureBlood PressureUnited States National Aeronautics and Space AdministrationPseudotumor CerebriSolar ActivityExtravehicular ActivityPapilledemaSpacecraftWeightlessness CountermeasuresHydrocephalusMonitoring, PhysiologicVisible Human ProjectsBrain InjuriesCerebrovascular CirculationCerebrospinal Fluid ShuntsDecompressive CraniectomyLinear Energy TransferOrthostatic IntoleranceBed RestBrain EdemaVentriculostomyBlood Circulation TimeCraniocerebral TraumaTransducers, PressureDiuretics, OsmoticGlasgow Coma ScaleHydrostatic PressureHypotension, OrthostaticHypergravityHead-Down TiltHindlimb SuspensionSpinal PunctureCraniotomySubdural SpaceMannitolCerebrospinal Fluid PressureCranial SinusesSubarachnoid SpaceHeavy IonsCerebral VentriculographyCerebrospinal Fluid