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Related Concept Videos

Weightlessness01:01

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When an object is dropped, it accelerates toward the center of the Earth. If the net external force on the object is its weight, it is said to be in free fall; that is, the only force acting on the object is gravity. Galileo was instrumental in showing that, in the absence of air resistance, all objects fall with the same acceleration g. However, when objects on the Earth fall downward, they are never truly in free fall, because there is always some upward resistance force from the air acting...
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Apparent Weight01:09

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True weight is the measure of the gravitational force acting on an object. However, if the object accelerates, its measured weight is different from its true weight. Similar observations can be made when the object is submerged in water. An object's weight in water is its apparent weight, which is equal to the difference between its true weight and the buoyant forces.
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Gravitational Potential Energy01:14

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Potential energy is not just a property of each object, but also a property of the interactions between objects in a chosen system. For each type of interaction present in a system, there is a corresponding type of potential energy. The total potential energy of the system is the sum of the potential energies of all the objects. Potential energy can be classified into two major categories: gravitational potential energy and elastic potential energy. The potential energy associated with a...
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Measuring Acceleration Due to Gravity01:12

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Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
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Variation in Acceleration due to Gravity near the Earth's Surface01:20

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An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
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Acceleration due to Gravity on Other Planets01:24

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The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
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Updated: Jan 16, 2026

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Gravity, microgravity, and artificial gravity: physiological effects, implementation, and applications.

Nandu Goswami1,2, Andrew Philip Blaber3, Giovanna Valenti4

  • 1Gravitational Physiology and Medicine Research Unit, Division of Physiology and Pathophysiology, Otto Loewi Research Center of Vascular Biology, Immunity and Inflammation, Medical University of Graz, Graz, Austria.

Physiological Reviews
|September 29, 2025
PubMed
Summary
This summary is machine-generated.

Spaceflight reveals how gravity affects human physiology, accelerating aging-like effects. Research in altered gravity offers insights into countermeasures for both astronauts and aging populations, promoting health and reducing frailty.

Keywords:
artificial gravitybed restgravitymicrogravityspaceflight

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Area of Science:

  • Human physiology
  • Space medicine
  • Gerontology

Background:

  • Gravity profoundly impacts human physiological systems, including skeletal, muscular, cardiovascular, respiratory, and neurological functions.
  • The brain lacks a specific gravity-sensing region, relying on the vestibular network (graviception) for interpreting gravitational cues.
  • Earth's gravity causes blood pooling in legs, triggering compensatory mechanisms for cerebral perfusion, which are disrupted in microgravity.

Purpose of the Study:

  • To explore the physiological effects of altered gravity on the human body.
  • To investigate spaceflight as a model for accelerated aging.
  • To identify potential countermeasures for physiological decline in altered gravity and aging populations.

Main Methods:

  • Analysis of physiological changes during spaceflight and Earth-based analogs (bed rest, dry immersion, parabolic flights).
  • Comparison of spaceflight-induced deconditioning with aging-related frailty.
  • Evaluation of countermeasures for muscle mass, cardiovascular stability, and postural control.

Main Results:

  • Microgravity causes fluid shifts, visual disturbances, cerebral changes, and increased thrombosis risk.
  • Prolonged spaceflight leads to muscle atrophy, bone demineralization, cardiovascular deconditioning, and orthostatic intolerance.
  • Altered gravity environments induce postural instability, orthostatic hypotension, falls, and fractures, mimicking aspects of aging and frailty.

Conclusions:

  • Spaceflight serves as a valuable model for studying accelerated aging and its associated physiological decline.
  • Countermeasures developed for spaceflight, such as targeted exercise and fluid management, show promise for treating frailty in older adults.
  • Bridging space medicine and aging research can lead to innovative therapies to mitigate frailty and improve quality of life.