Quantum Gravity Gradiometer (QGG)

Quantum Gravity Gradiometer (QGG) Latest News

NASA scientists have proposed an innovative use of cold atom-based quantum gravity gradiometers (QGGs) to measure how the Earth’s mass distribution is changing, especially due to climate change.

About Quantum Gravity Gradiometer (QGG)

• Quantum Gravity Gradiometer (QGG): NASA scientists propose placing a Quantum Gravity Gradiometer onboard a satellite to detect minute gravitational changes.
  • In a QGG, atoms of a specific element are cooled to near absolute zero in a vacuum, transforming them into wave-like states.
  • Lasers manipulate these atoms, and the atoms undergo a phase shift directly related to the gravitational force acting upon them.
  • This setup can detect differences in acceleration as small as 10⁻¹⁵ m/s² over a distance of just 1 meter.
• This includes estimating the mass of large formations like the Himalayas and monitoring the movement of water, ice, and geological materials with extreme precision from low Earth orbit.
• Gravitational force varies with mass distribution: The gravitational force experienced at different points on the Earth’s surface is not uniform; it depends on the mass of nearby objects.
  • For instance, gravitational force near a mountain range is stronger than in less dense regions, like cities or flat plains.
• Gravity Gradiometer: It is a highly sensitive instrument that measures how gravitational acceleration changes from one place to another.
  • For example, when a ball is dropped, the acceleration due to gravity can vary slightly depending on local mass differences.
  • These devices are used in resource exploration—like locating hydrocarbon deposits, as oil and gas are less dense than surrounding rock.

Source: SP

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