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- Weightlessness abstract "Weightlessness, or an absence of 'weight', is an absence of stress and strain resulting from externally applied mechanical contact-forces, typically normal forces from floors, seats, beds, scales, and the like. Counterintuitively, a uniform gravitational field does not by itself cause stress or strain, and a body in free fall in such an environment experiences no g-force acceleration and feels weightless. This is also termed \"zero-g\" where the term is more correctly understood as meaning \"zero g-force.\"When bodies are acted upon by non-gravitational forces, as in a centrifuge, a rotating space station, or within a space ship with rockets firing, a sensation of weight is produced, as the contact forces from the moving structure act to overcome the body's inertia. In such cases, a sensation of weight, in the sense of a state of stress can occur, even if the gravitational field was zero. In such cases, g-forces are felt, and bodies are not weightless.When the gravitational field is non-uniform, a body in free fall suffers tidal effects and is not stress-free. Near a black hole, such tidal effects can be very strong. In the case of the Earth, the effects are minor, especially on objects of relatively small dimension (such as the human body or a spacecraft) and the overall sensation of weightlessness in these cases is preserved. This condition is known as microgravity and it prevails in orbiting spacecraft.In October 2015, the NASA Office of Inspector General issued a health hazards report related to human spaceflight, including a human mission to Mars.".
- Weightlessness thumbnail Foale_ZeroG.jpg?width=300.
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- Weightlessness wikiPageExternalLink issphysiology_lite.html.
- Weightlessness wikiPageExternalLink NASA-Reduced-Gravity-Aircraft.htm.
- Weightlessness wikiPageExternalLink zero-gravity-in-russia.html.
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- Weightlessness wikiPageWikiLink Acceleration.
- Weightlessness wikiPageWikiLink Accelerometer.
- Weightlessness wikiPageWikiLink Advection.
- Weightlessness wikiPageWikiLink Airbus_A300.
- Weightlessness wikiPageWikiLink Alzheimers_disease.
- Weightlessness wikiPageWikiLink Artificial_gravity.
- Weightlessness wikiPageWikiLink Astronaut.
- Weightlessness wikiPageWikiLink Atmospheric_entry.
- Weightlessness wikiPageWikiLink Black_hole.
- Weightlessness wikiPageWikiLink Boeing_727.
- Weightlessness wikiPageWikiLink Bordeaux–Mérignac_Airport.
- Weightlessness wikiPageWikiLink Brain.
- Weightlessness wikiPageWikiLink Bremen.
- Weightlessness wikiPageWikiLink Category:Gravitation.
- Weightlessness wikiPageWikiLink Category:Space_medicine.
- Weightlessness wikiPageWikiLink Category:Weightlessness.
- Weightlessness wikiPageWikiLink Centripetal_force.
- Weightlessness wikiPageWikiLink Circulatory_system.
- Weightlessness wikiPageWikiLink Cleveland.
- Weightlessness wikiPageWikiLink Clinostat.
- Weightlessness wikiPageWikiLink Cohesion_(chemistry).
- Weightlessness wikiPageWikiLink Column.
- Weightlessness wikiPageWikiLink Compression_(physics).
- Weightlessness wikiPageWikiLink Convection.
- Weightlessness wikiPageWikiLink Cross_section_(geometry).
- Weightlessness wikiPageWikiLink Drag_(physics).
- Weightlessness wikiPageWikiLink Drop_tube.
- Weightlessness wikiPageWikiLink Effect_of_spaceflight_on_the_human_body.
- Weightlessness wikiPageWikiLink Ellington_Field_Joint_Reserve_Base.
- Weightlessness wikiPageWikiLink Equivalence_principle.
- Weightlessness wikiPageWikiLink Euclidean_vector.
- Weightlessness wikiPageWikiLink European_Low_Gravity_Research_Association.
- Weightlessness wikiPageWikiLink European_Space_Agency.
- Weightlessness wikiPageWikiLink Extravehicular_activity.
- Weightlessness wikiPageWikiLink Fallturm_Bremen.
- Weightlessness wikiPageWikiLink File:Clayton_Anderson_zero_g.jpg.
- Weightlessness wikiPageWikiLink Flatulence.
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- Weightlessness wikiPageWikiLink G-force.
- Weightlessness wikiPageWikiLink General_relativity.
- Weightlessness wikiPageWikiLink Geostationary_orbit.
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- Weightlessness wikiPageWikiLink Glenn_Research_Center.
- Weightlessness wikiPageWikiLink Gravitational_field.
- Weightlessness wikiPageWikiLink Grenoble.
- Weightlessness wikiPageWikiLink Headache.
- Weightlessness wikiPageWikiLink Houston.
- Weightlessness wikiPageWikiLink HowStuffWorks.
- Weightlessness wikiPageWikiLink Human_mission_to_Mars.
- Weightlessness wikiPageWikiLink Human_spaceflight.
- Weightlessness wikiPageWikiLink Ilyushin_Il-76.
- Weightlessness wikiPageWikiLink Immune_system.
- Weightlessness wikiPageWikiLink Inertia.
- Weightlessness wikiPageWikiLink Inertial_frame_of_reference.
- Weightlessness wikiPageWikiLink International_Space_Station.
- Weightlessness wikiPageWikiLink Jake_Garn.
- Weightlessness wikiPageWikiLink James_Oberg.
- Weightlessness wikiPageWikiLink Lethargy.
- Weightlessness wikiPageWikiLink Levitation.
- Weightlessness wikiPageWikiLink Lift_(force).
- Weightlessness wikiPageWikiLink Lyndon_B._Johnson_Space_Center.
- Weightlessness wikiPageWikiLink Mars.
- Weightlessness wikiPageWikiLink Marshall_Space_Flight_Center.
- Weightlessness wikiPageWikiLink McDonnell_Douglas_C-9.
- Weightlessness wikiPageWikiLink Micro-Gravity_Laboratory_of_Japan.
- Weightlessness wikiPageWikiLink Micro-g_environment.
- Weightlessness wikiPageWikiLink Microgravity_University.
- Weightlessness wikiPageWikiLink Muscle_atrophy.
- Weightlessness wikiPageWikiLink NASA.
- Weightlessness wikiPageWikiLink NASA_Office_of_Inspector_General.
- Weightlessness wikiPageWikiLink Nausea.
- Weightlessness wikiPageWikiLink Neutral_Buoyancy_Laboratory.
- Weightlessness wikiPageWikiLink Neutral_buoyancy.
- Weightlessness wikiPageWikiLink Novespace.
- Weightlessness wikiPageWikiLink Orbit.
- Weightlessness wikiPageWikiLink Orbital_maneuver.
- Weightlessness wikiPageWikiLink Parabola.
- Weightlessness wikiPageWikiLink Parachute.
- Weightlessness wikiPageWikiLink Pelletizing.
- Weightlessness wikiPageWikiLink Polystyrene.
- Weightlessness wikiPageWikiLink Proper_acceleration.
- Weightlessness wikiPageWikiLink Red_blood_cell.
- Weightlessness wikiPageWikiLink Reduced-gravity_aircraft.
- Weightlessness wikiPageWikiLink Reduced_muscle_mass,_strength_and_performance_in_space.
- Weightlessness wikiPageWikiLink Rocket.
- Weightlessness wikiPageWikiLink Russia.
- Weightlessness wikiPageWikiLink STS-51-D.
- Weightlessness wikiPageWikiLink Salmonella_enterica_subsp._enterica.