The importance of tidal friction for the early history of the Moon

1967 ◽  
Vol 296 (1446) ◽  
pp. 293-297 ◽  
Keyword(s):  
Body Problem ◽  
Early History ◽  
The Moon ◽  
Tidal Friction ◽  
Moon System ◽  
Two Body Problem ◽  
Dissipation Of Energy ◽  
The Earth ◽  
History Of ◽  
Rotation Of The Earth

About ten years ago I began to investigate tidal friction and its influence on the evolution of the Earth-Moon system, and I first describe the model used. Following the ideas of G. H. Darwin, I treated the system as a two-body problem. The Moon raises tides on the Earth and the two bulges of the tidal ellipsoid, because of the rotation of the Earth, revolve twice daily. The line joining them forms an angle ψ with the line joining their centres; this is a measure of the dissipation of energy. The Moon, considered as a point mass, exerts a retarding couple on the deviated tidal ellipsoid. Contrary to Darwin, I have limited myself to the case of small angles ψ , but I have allowed for arbitrary changes of the other parameters of the orbit, for example, changes of the obliquity ∊ between the earth’s axis and the pole of the orbit as well as changes of the eccentricity.

scholarly journals Dissipation Of Tidal Energy By Flexing Ice Shelves

1979 ◽  
Vol 24 (90) ◽  
pp. 482-482
Author(s):  
C. S. M. Doake
Keyword(s):  
Plastic Deformation ◽  
Tidal Energy ◽  
Single Source ◽  
The Moon ◽  
Tidal Friction ◽  
Ice Shelves ◽  
Source Contribution ◽  
The Earth ◽  
Grounding Line ◽  
Rotation Of The Earth

Plastic deformation of ice shelves in the region along the grounding line where they bend with the tide can dissipate enough tidal energy to make them the most important single source contribution to tidal friction (Doake, 1978). Some of the effects are to slow the rotation of the Earth and to cause the moon to retreat from the Earth.

The early history of the Moon and the Earth

Icarus ◽  
1962 ◽  
Vol 1 (1-6) ◽  
pp. 357-363 ◽  
Author(s):  
H. Alfvén
Keyword(s):  
Early History ◽  
The Moon ◽  
The Earth ◽  
History Of

scholarly journals Initial Parameter Analysis about Resonant Orbits in Earth-Moon System

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
Li-Bo Liu ◽  
Ying-Jing Qian ◽  
Xiao-Dong Yang
Keyword(s):  
Body Problem ◽  
Parameter Analysis ◽  
Initial Parameter ◽  
The Moon ◽  
Three Body Problem ◽  
Ballistic Capture ◽  
Moon System ◽  
Two Body Problem ◽  
Resonant Orbits ◽  
Three Body

The initial parameters about resonant orbits in the Earth-Moon system were investigated in this study. Resonant orbits with different ratios are obtained in the two-body problem and planar circular restricted three-body problem (i.e., PCRTBP). It is found that the eccentricity and initial phase are two important initial parameters of resonant orbits that affect the closest distance between the spacecraft and the Moon. Potential resonant transition or resonant flyby may occur depending on the possibility of the spacecraft approaching the Moon. Based on an analysis of ballistic capture and flyby, the Kepler energy and the planet’s perturbed gravitational sphere are used as criteria to establish connections between the initial parameters and the possible “steady” resonant orbits. The initial parameter intervals that can cause instability of the resonant orbits in the CRTBP are obtained. Examples of resonant orbits in 1:2 and 2:1 resonances are provided to verify the proposed criteria.

scholarly journals Lunar exploration: opening a window into the history and evolution of the inner Solar System

2014 ◽  
Vol 372 (2024) ◽  
pp. 20130315 ◽  
Author(s):  
Ian A. Crawford ◽  
Katherine H. Joy
Keyword(s):  
Solar System ◽  
Lunar Exploration ◽  
The Moon ◽  
Moon System ◽  
Origin And Evolution ◽  
The Earth ◽  
Geological Evolution ◽  
History Of ◽  
Rocky Planets

The lunar geological record contains a rich archive of the history of the inner Solar System, including information relevant to understanding the origin and evolution of the Earth–Moon system, the geological evolution of rocky planets, and our local cosmic environment. This paper provides a brief review of lunar exploration to-date and describes how future exploration initiatives will further advance our understanding of the origin and evolution of the Moon, the Earth–Moon system and of the Solar System more generally. It is concluded that further advances will require the placing of new scientific instruments on, and the return of additional samples from, the lunar surface. Some of these scientific objectives can be achieved robotically, for example by in situ geochemical and geophysical measurements and through carefully targeted sample return missions. However, in the longer term, we argue that lunar science would greatly benefit from renewed human operations on the surface of the Moon, such as would be facilitated by implementing the recently proposed Global Exploration Roadmap.

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