Document · 2013
Davies & Wagner: 'Searching for alien artifacts on the Moon' (2013)
Acta Astronautica 89 (2013), pp. 261-265 (online November 2011), doi:10.1016/j.actaastro.2011.10.022. Lists messages, instruments, trash and large-scale landscape changes as things to look for, and proposes public searches of LRO images.
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Lunar Reconnaissance Orbiter (LROC) missionSagan 1963: 'Direct contact among galactic civilizations by relativistic interstellar spaceflight' document