Results 71 to 80 of about 2,111,313 (164)

A Low‐Viscosity Lower Lunar Mantle Implied by Measured Monthly and Yearly Tides

AGU Advances
The Moon's frequency‐dependent tidal response, expressed as temporal variations in its gravity field through the Love number k2 and as dissipation through the quality factor Q, provides information about its interior structure.
Sander Goossens, Isamu Matsuyama, Gael Cascioli, Erwan Mazarico   +3 more
doaj   +1 more source

Mapping moon craters: Scientific knowledge from 1965 to 2022: Systematic review

Egyptian Journal of Remote Sensing and Space Sciences
This systematic review examines development of techniques used in lunar crater mapping between 1965 and 2022. Using the Web of Science and Google Scholar databases, the systematic review adhered to specific criteria that focus on post-1965 research ...
Azizah Aziz Al Shehri
doaj   +1 more source

Lunar laser ranging data identification and management [PDF]

, 1979
Activity under the subject grant during the first half of fiscal year 1979 at the University of Texas at Austin is reported. Raw lunar laser ranging data submitted by McDonald Observatory, Fort Davis, Texas and by the Australian Division of National ...

core  

Prospect for Measuring Lunar Tidal Deformation and Displacement Love Numbers With Earth-Based Radar

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Lunar tidal deformation (LTD), characterized by the vertical (${{{\bm{h}}}_2}$) and horizontal (${{{\bm{l}}}_2}$) displacement Love numbers, is a key to deciphering the interior structure of the Moon.
Gen Li, Zegang Ding, Zihan Hu, Yifan Wang, Zehua Dong, Tao Zeng   +5 more
doaj   +1 more source

Lunar Science from Laser Ranging - Present and Future

, 2008
The interior properties of the Moon influence lunar tides and rotation. Three-axis rotation (physical librations) and tides are sensed by tracking lunar landers.
Turyshev, S. G., Williams, James G., Ratcliff, J. Todd   +2 more
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Towards sustainable lunar habitats with ISRU in Chang’E mission: Mechanical–energy evolution and damage mechanisms of LPBF-printed lunar regolith simulate

International Journal of Mining Science and Technology
Targeting Chang’E-8 mission’ in-situ resource utilization (ISRU) for sustainable lunar habitats, laser powder bed fusion (LPBF) provides a viable pathway for in-situ additive manufacturing of lunar regolith.
Sheng Li, Xinyi Li, Yuyue Gao, Bo Zhou, Yan Zhou, Jian Song, Cheng Zhou, Wei Yao, Lieyun Ding   +8 more
doaj   +1 more source

Measuring the De Sitter precession with a new Earth’s satellite to the $$\simeq 10^{-5}$$ ≃10-5 level: a proposal

European Physical Journal C: Particles and Fields, 2019
The inclination I of an Earth’s satellite in polar orbit undergoes a secular De Sitter precession of $$-\,7.6$$ -7.6 milliarcseconds per year for a suitable choice of the initial value of its non-circulating node $$\Omega $$ Ω .
Lorenzo Iorio
doaj   +1 more source

Varying Physical Constants, Astrometric Anomalies, Redshift and Hubble Units

Galaxies, 2019
We have developed a cosmological model by allowing the speed of light c, gravitational constant G and cosmological constant Λ in the Einstein filed equation to vary in time, and solved them for Robertson-Walker metric.
Rajendra P. Gupta
doaj   +1 more source

The dynamic universe: space as a spherically closed zero-energy system

Frontiers in Astronomy and Space Sciences
Recent observations, particularly from the James Webb Space Telescope (JWST), have revealed unexpectedly massive compact objects and rapidly emerging galactic structures at very early cosmic times.
Tuomo Suntola
doaj   +1 more source

Determining Evolution of Cosmological Constant, Gravitational Constant and Speed of Light Using Nonadiabatic Cosmological Model and LLR Findings

Galaxies, 2019
We have shown that the Hubble constant H 0 embodies the information about the evolutionary nature of the cosmological constant Λ , gravitational constant G , and the speed of light c .
Rajendra P. Gupta
doaj   +1 more source