English: Apollo 15's Lunar Ranging Retro Reflector (LRRR). Original Caption: 125:33:21 Dave took this cross-Sun from the south of the LRRR, showing the orientation gnomon and bubble level. The LRRR, reflects laser pulses back to the telescopes on Earth used to illuminate it. By measuring the two-way travel time between the telescope and the LRRR, experiments can determine the distance between the two to a few centimeters and address such issues as Einstein's Theory of General Relativity and the existence of a liquid lunar core. As of February 2005, the retroreflectors deployed on Apollos 11, 14, and 15 were still being used in conjunction with a dedicated facility at the MacDondald Observatory in Texas.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
((BotMoveToCommons|en.wikipedia|year=((subst:CURRENTYEAR))|month=((subst:CURRENTMONTHNAME))|day=((subst:CURRENTDAY)))) ((Information |Description=((en|Apollo 15's LRRR.)) |Source=Transferred from [http://en.wikipedia.org en.wikipedia]; transferred to Com
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):