Video Experimental Relacionado
Updated: Jun 26, 2026
06:14
Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
Published on: July 30, 2020
El magnetismo lunar temprano es el magnetismo lunar temprano
Ian Garrick-Bethell1, Benjamin P Weiss, David L Shuster
1Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 54-521, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. iang@mit.edu
Science (New York, N.Y.)
|January 20, 2009
Resumen
La Luna probablemente tenía una dínamo de núcleo metálico, que generaba un campo magnético hace más de 4.200 millones de años. El análisis de la antigua roca lunar apoya esta hipótesis de la dinamo central.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La geofísica es la geofísica.
- La ciencia lunar es la ciencia lunar.
Sus antecedentes:
- La existencia de un núcleo metálico y una dínamo en la Luna es incierta.
- La magnetización de la corteza lunar podría originarse de impactos, no de una dínamo.
Objetivo del estudio:
- Investigar el origen de la magnetización lunar.
- Determinar si la Luna poseía una antigua dinamo de núcleo.
Principales métodos:
- Las mediciones magnéticas de la troctolita 76535.5.
- 40Ar/39Ar datación termocronológica de la roca lunar.
Principales resultados:
- Identificaron la roca lunar no sacudida más antigua conocida, el troctolito 76535.
- Los datos sugieren que existió un campo magnético lunar de larga duración (≥1 microtesla) hace unos 4.200 millones de años.
Conclusiones:
- La edad temprana, la intensidad y la duración del campo lunar apoyan una antigua dinámica del núcleo lunar.
- Este hallazgo desafía las teorías de magnetización generadas por el impacto.
Videos de Conceptos Relacionados
01:30Magnetism
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
01:16Gravitation
In the years before Newton, a general belief prevailed that different laws governed objects in the sky than objects on Earth. When Kepler wrote down the three laws of planetary motion, explaining in detail the geometrical properties of the planetary orbits around the Sun, there was no immediate idea to discern their connection with more fundamental laws. It was Isaac Newton who, in 1665–66, figured out the connection between planetary motion, the motion of the moon around the Earth, and the...
01:27Magnetic Fields
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
01:11Atomic 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...
01:26Diamagnetism
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.
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.
01:24Potential Due to a Magnetized Object
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...