Laser link with pulsed laser from JPL/Apache Point Observatory, New Mexico or other earth locations to
illuminate the retro-reflectors positioned by the Apollo lunar missions 15, 16, 17 respectively 11, 14, 15
(only two triangles are shown).
About the triangles
The shown triangle - marking the landing sites - are a tribute to Pythagoras and C.F.Gauss, inspired
by a proposal of C.F.Gauss to draw a huge pythagorean triangle on earth to set a signal of civilization toward potential
viewers on Mars (described by Isaac Asimov in his book "Extraterrestrial Civilizations", 1979).