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Related Concept Videos

Faraday Disk Dynamo01:23

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
Nuclear Fusion02:45

Nuclear Fusion

The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

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Conservation of Angular Momentum

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce internal...

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Related Experiment Video

Updated: May 25, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 15, 2013

A long-lived lunar core dynamo.

Erin K Shea1, Benjamin P Weiss, William S Cassata

  • 1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|January 28, 2012
PubMed
Summary
This summary is machine-generated.

A lunar core dynamo likely existed 4.2 billion years ago. New analysis of a 3.7-billion-year-old lunar sample extends the dynamo

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Last Updated: May 25, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
06:14

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Area of Science:

  • Lunar geology and geophysics
  • Paleomagnetism
  • Planetary science

Background:

  • The existence and duration of the Moon's core dynamo are not fully understood.
  • Previous studies suggest a lunar dynamo existed 4.2 billion years ago, but its later history remains unclear.

Purpose of the Study:

  • To investigate the longevity and intensity of the lunar core dynamo.
  • To analyze a 3.7-billion-year-old lunar mare basalt sample for paleomagnetic evidence.

Main Methods:

  • Paleomagnetic measurements on lunar sample 10020.
  • Petrologic analysis.
  • (40)Ar/(39)Ar thermochronometry.

Main Results:

  • The 3.7-billion-year-old sample 10020 exhibits a high-coercivity magnetization.
  • The magnetization indicates acquisition in a stable lunar paleofield of at least 12 microteslas.
  • This evidence extends the known lifetime of the lunar dynamo by 500 million years.

Conclusions:

  • The lunar dynamo persisted for at least 3.7 billion years.
  • A long-lived lunar dynamo likely required a power source beyond simple internal cooling.
  • The strong inferred paleofield intensity challenges existing dynamo theories.