Results 1 to 10 of about 2,111,313 (164)

Tests of Gravity Using Lunar Laser Ranging [PDF]

Living Reviews in Relativity, 2010
Lunar laser ranging (LLR) has been a workhorse for testing general relativity over the past four decades. The three retroreflector arrays put on the Moon by the Apollo astronauts and the French built arrays on the Soviet Lunokhod rovers continue to be ...
Stephen M. Merkowitz
doaj   +7 more sources

Recent Progress in Lunar Laser Ranging at Grasse Laser Ranging Station

Earth and Space Science, 2020
Based on a fully passive space segment, the lunar laser ranging experiment is the last of the Apollo Lunar Surface Experiments Package to operate. Observations from the Grasse lunar laser ranging station have been made on a daily basis since the first ...
Julien Chabé, Clément Courde, Jean‐Marie Torre, Sébastien Bouquillon, Adrien Bourgoin, Mourad Aimar, Dominique Albanèse, Bertrand Chauvineau, Hervé Mariey, Grégoire Martinot‐Lagarde, Nicolas Maurice, Duy‐Hà Phung, Etienne Samain, Hervé Viot   +13 more
doaj   +3 more sources

A Tutorial on Retroreflectors and Arrays Used in Satellite and Lunar Laser Ranging

Photonics, 2023
The present paper discusses the basics of retroreflector theory and the manner in which they are combined in arrays to service the laser tracking of artificial satellites and the Moon.
John J. Degnan
doaj   +3 more sources

A 3D-Printed SFE-Graded Alloy Mitigates Cryogenic Discontinuous Plastic Flow and Hydrogen Embrittlement. [PDF]

Adv Sci (Weinh)
A novel strategy features gradient composition and stacking fault energy‐tuned (CoCrMn)100‐2xFexNix fabricated via in situ alloying additive manufacturing. This design circumvents cryogenic discontinuous plastic flow and hydrogen embrittlement of metallic materials under quasi‐static loading and hydrogen‐rich environment relevant to lunar polar ...
Wu R, Geng A, Geng P, Park H, Kim ES, Oh SH, Schönecker S, Li X, Zhang T, Li S, Lee BJ, Kim HS.   +11 more
europepmc   +2 more sources

Analysis of the Effect of Tilted Corner Cube Reflector Arrays on Lunar Laser Ranging

Remote Sensing
This paper primarily investigates the effect of the tilt of corner cube reflector (CCR) arrays on lunar laser ranging (LLR). A mathematical model was established to study the random errors caused by the tilt of the CCR arrays.
Jin Cao, Rufeng Tang, Kai Huang, Zhulian Li, Yongzhang Yang, Kai Huang, Jintao Li, Yuqiang Li   +7 more
doaj   +3 more sources

MILLIMETRE MOON MEASUREMENT: 50 YEARS OF LUNAR LASER RANGING SINCE APOLLO 11! [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2020
Since the dawn of time the Moon has held fascination for the earliest humans who saw it as a natural navigational beacon, a heavenly body to be revered and a poetic inspiration.
J. F. Brock
doaj   +1 more source

First two-way laser ranging to a lunar orbiter: infrared observations from the Grasse station to LRO’s retro-reflector array

Earth, Planets and Space, 2020
We present the results of the first series of successful two-way laser ranging experiments from a ground station, the Lunar Laser Ranging (LLR) station in Grasse, France, to a spacecraft at lunar distance, the Lunar Reconnaissance Orbiter (LRO).
Erwan Mazarico, Xiaoli Sun, Jean-Marie Torre, Clément Courde, Julien Chabé, Mourad Aimar, Hervé Mariey, Nicolas Maurice, Michael K. Barker, Dandan Mao, Daniel R. Cremons, Sébastien Bouquillon, Teddy Carlucci, Vishnu Viswanathan, Frank G. Lemoine, Adrien Bourgoin, Pierre Exertier, Gregory A. Neumann, Maria T. Zuber, David E. Smith   +19 more
doaj   +1 more source

Lunar Laser Ranging Retroreflectors: Velocity Aberration and Diffraction Pattern

The Planetary Science Journal, 2023
The Lunar Laser Ranging (LLR) retroreflector arrays have been on the Moon for half a century. During that time, the laser range uncertainty has improved by a factor of 100. Consequently, the science results have also improved by orders of magnitude.
James G. Williams, Luca Porcelli, Simone Dell’Agnello, Lorenza Mauro, Marco Muccino, Douglas G. Currie, Dennis Wellnitz, Chensheng Wu, Dale H. Boggs, Nathan H. Johnson   +9 more
doaj   +1 more source

Development of SMA Spring Linear Actuator for an Autonomous Lock and Release Mechanism: Application for the Gravity-Assisted Pointing System in Moon to Earth Alignment of Directional Devices

Aerospace, 2022
The next generation lunar reflector (NGLR) experiment is one of the experiments selected by NASA in the framework of the commercial lunar payload services (CLPS) initiative.
Girolamo Costanza, Giovanni Ottavio Delle Monache, Maria Elisa Tata, Stefano Filosi   +3 more
doaj   +1 more source

Laser enhancements for Lunar Laser Ranging at 532 nm

Results in Physics, 2016
This article exposes how we improved (by more than a factor of four) the green Lunar Laser Ranging instrumental sensitivity of the French telemetric station of the “Observatoire de la Côte d’Azur” in 2012.
G. Martinot-Lagarde, M. Aimar, D. Albanèse, C. Courde, P. Exertier, A. Fienga, H. Mariey, G. Métris, R. Rigard-Cerison, E. Samain, J.-M. Torre, H. Viot   +11 more
doaj   +1 more source