Explore: Retroreflectors

be replaced by appropriately colored retroreflectors, the most important of which are the white retroreflectors that delineate the runway edges, and must

Retroreflectors are devices which reflect light back to its source. Six retroreflectors were left at six sites on the Moon by three crews of the Apollo

reflected back to Earth by the Moon's surface or by one of several retroreflectors installed on the Moon. Three were placed by the United States' Apollo

millimetres, and more satellites equipped with retroreflectors have been launched. Several sets of retroreflectors were installed on Earth's Moon as part of

and red rear side marker lights and retroreflectors are required. The law initially required lights or retroreflectors on vehicles manufactured after 1 January

1966, but no uncrewed landers carried retroreflectors before Lunokhod 1 in November 1970. The retroreflectors are proof that human-made probes reached

pounds), covered with 426 cube-corner retroreflectors, giving them the appearance of disco balls. Of these retroreflectors, 422 are made from fused silica glass

recorded. The presence of retroreflectors (mirrors used as targets for Earth-based tracking lasers) from the Laser Ranging Retroreflector Experiment (LRRR) is

time taken for laser light to travel between stations on Earth and retroreflectors placed on the Moon. The precision of the range measurements determines

Apollo mission artificial objects, such as a hammer and other tools, retroreflectors, Apollo Lunar Surface Experiments Packages, or the commemorative, artistic