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Related Concept Videos

Mass and Weight01:19

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Mass and weight are often used interchangeably in everyday conversation. For example,  medical records often show our weight in kilograms, but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of the Earth on an object. It depends on the distance from the center of the Earth. Weight dramatically varies if we leave the Earth's surface, unlike mass, which does not vary with location. On the Moon, for example, the...
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According to Albert Einstein (1897-1955), free-falling and feeling weightless are intrinsically linked. If a person were in free-fall under gravity, for example, diving towards the Earth from an airplane, they would feel completely weightless. Similarly, a person descending in a lift may feel partially weightless. Broadly speaking, it is assumed that an object in a uniform gravitational field and an object undergoing constant acceleration in the absence of gravity are under the same...
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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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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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A rocket's velocity in the presence of a gravitational field is decreased by the amount of force exerted by Earth's gravitational field, which opposes the motion of the rocket. If we consider thrust, that is, the force exerted on a rocket by the exhaust gases, then a rocket's thrust is greater in outer space than in the atmosphere or on a launch pad. In fact, gases are easier to expel in a vacuum.
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Exploring the Effects of Spaceflight on Mouse Physiology using the Open Access NASA GeneLab Platform
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Comments on Body Mass Changes During Long-Duration Spaceflight.

William Thornton1

  • 1Boerne, TX, USA.

Aerospace Medicine and Human Performance
|December 3, 2015
PubMed
Summary
This summary is machine-generated.

Long-duration spaceflight causes body mass changes. This study compares two space programs, finding significant differences in devices, application, and results for tracking astronaut body mass.

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Area of Science:

  • Space medicine
  • Human physiology
  • Astronaut health

Background:

  • Understanding body mass changes is crucial for astronaut health during long space missions.
  • Previous studies have utilized various methods to track these physiological adaptations.

Purpose of the Study:

  • To compare devices and methodologies used in two distinct long-duration spaceflight programs.
  • To analyze the application, results, and interpretation of body mass measurements from these programs.

Main Methods:

  • Comparative analysis of data and protocols from two spaceflight programs.
  • Review of measurement devices and their application in space environments.

Main Results:

  • Significant differences were identified across all aspects examined between the two programs.
  • Variations were noted in device selection, application procedures, and data interpretation.

Conclusions:

  • The methodologies and outcomes for assessing body mass changes in long-duration spaceflight differ substantially between programs.
  • Further standardization or understanding of these differences is warranted for future space exploration.