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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...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
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...
Magnetism01:30

Magnetism

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Nuclear Fusion02:45

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Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

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Related Experiment Video

Updated: May 17, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

An ancient core dynamo in asteroid Vesta.

Roger R Fu1, Benjamin P Weiss, David L Shuster

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

Science (New York, N.Y.)
|October 16, 2012
PubMed
Summary
This summary is machine-generated.

Vesta, the smallest differentiated asteroid, likely had a metallic core and dynamo magnetic field 3.69 billion years ago. This ancient magnetic field protected Vesta from space weathering, evidenced by meteorite magnetization.

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Area of Science:

  • Planetary Science
  • Geophysics
  • Cosmochemistry

Background:

  • Vesta is the smallest differentiated planetary body.
  • Uncertainty exists regarding Vesta's formation of metallic cores and dynamo magnetic fields.

Purpose of the Study:

  • To investigate Vesta's early magnetic field generation.
  • To determine if Vesta possessed an advecting liquid metallic core.

Main Methods:

  • Analysis of remanent magnetization in the Allan Hills A81001 eucrite meteorite.
  • Paleomagnetic dating of magnetization acquisition during Vesta's cooling.

Main Results:

  • Remanent magnetization indicates a surface magnetic field of at least 2 microteslas on Vesta 3.69 billion years ago.
  • The magnetic field likely originated from crustal remanence, suggesting an earlier dynamo.
  • Inferred crustal fields explain the absence of solar wind ion weathering effects.

Conclusions:

  • Vesta likely formed an advecting liquid metallic core.
  • An early dynamo generated a significant magnetic field on Vesta.
  • Vesta's magnetic field played a crucial role in its surface evolution.