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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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Rockets range in size from small fireworks that ordinary people use to the enormous Saturn V that once propelled massive payloads toward the Moon. The propulsion of all rockets, jet engines, deflating balloons, and even squids and octopuses are explained by the same physical principle: Newton's third law of motion. The matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
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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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Related Experiment Video

Updated: Jul 9, 2025

Reduced-gravity Environment Hardware Demonstrations of a Prototype Miniaturized Flow Cytometer and Companion Microfluidic Mixing Technology
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Development and Characterization of a low intensity vibrational system for microgravity studies.

Omor M Khan1, Will Gasperini1, Chess Necessary2

  • 1Department of Mechanical and Biomedical Engineering, Boise State University.

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|December 4, 2023
PubMed
Summary

This study introduces the first automated low-intensity vibrational (LIV) bioreactor for the International Space Station (ISS). This innovation aims to mitigate muscle atrophy and bone density loss during long space missions.

Keywords:
low intensity vibrationmicrogravityscaffoldsvibrational bioreactor

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Area of Science:

  • Space biology
  • Biomedical engineering
  • Musculoskeletal research

Background:

  • Extended human spaceflight poses risks to the musculoskeletal system, including muscle atrophy and bone density loss.
  • Ground-based simulations show vibrational bioreactors can counteract these microgravity effects.
  • A gap exists in space-ready vibrational bioreactor technology for authentic microgravity research.

Approach:

  • Designed and characterized the first automated low-intensity vibrational (LIV) bioreactor for the International Space Station (ISS).
  • Selected an optimal linear guide for precise 1-axis acceleration control.
  • Analyzed thermal and diffusion dynamics and utilized BioMed Clear resin for advanced scaffold design.

Key Points:

  • The LIV bioreactor is specifically engineered for the ISS environment.
  • Ensures consistent acceleration for reliable experimental outcomes.
  • Utilizes novel materials for improved scaffold performance in space.

Conclusions:

  • This automated LIV bioreactor addresses a critical need for space-based musculoskeletal research.
  • Facilitates more authentic studies of microgravity's physiological impacts.
  • Crucial for ensuring astronaut health and safety in future long-duration space missions.