Concept information
Preferred term
LLR
Definition
- During three U.S. Apollo missions (11, 14, and 15) and two unmanned Soviet missions (Luna 17 and Luna 21), retro-reflectors were deployed near the landing sites between 1969 and 1973. The LLR experiment has continuously provided range data for about 41 years, generating about 17000 normal points. The main benefit of this space geodetic technique is the determination of a host of parameters describing lunar ephemeris, lunar physics, the Moon’s interior, various reference frames, Earth orientation parameters and the Earth-Moon dynamics. LLR has also become one of the strongest tools for testing Einstein's theory of general relativity in the solar system; no violations of general relativity have been found so far. However, the basis for all scientific analyses is more high quality data from a well-distributed global LLR network. (en)
Broader concept
- Laser Ranging (en)
Change note
- 2022-02-25 13:24:12.0 [tstevens] Insert Concept add broader relation (LLR [dbf63ec2-4855-4499-81a5-181dd76e4cb2,836044] - Laser Ranging [942876b3-fbd5-43d9-9e1f-170682f7b5b3,827925]);
URI
https://gcmd.earthdata.nasa.gov/kms/concept/dbf63ec2-4855-4499-81a5-181dd76e4cb2
{{label}}
{{#each values }} {{! loop through ConceptPropertyValue objects }}
{{#if prefLabel }}
{{/if}}
{{/each}}
{{#if notation }}{{ notation }} {{/if}}{{ prefLabel }}
{{#ifDifferentLabelLang lang }} ({{ lang }}){{/ifDifferentLabelLang}}
{{#if vocabName }}
{{ vocabName }}
{{/if}}