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Taken an hour after local sunset, this remarkable Surveyor shot shows a luminous "grid" and highly mysterious "brilliant beads of light" strung out along a supposedly airless lunar horizon, in an area of the Moon where (we now know) much of this same anomalous structure has been independently photographed from overhead by both the unmanned Lunar Orbiter and subsequent manned Apollo missions.
Surveyor 6, November 1967
One of seven photographs published in NASA Technical Report 32-1262 (NAS7-100), entitled: Surveyor 6 Mission Report, part III. television data; published by JPL at Cal. Tech., August 15, 1968. View angle of photograph west from western part of Sinus Medii, showing refraction of intense light from Sun (beads are image of photosphere) by surface material on horizon.
Surveyor 6 mission report. Part 3 - Television data
Author(s): Bird, T. H.; Smokler, M. I.; Smyth, D. L.
Abstract: Photographs and mosaics of lunar surface obtained from Surveyor 6
NASA Center: Jet Propulsion Laboratory
Publication Year: 1968
Added to NTRS: 2007-03-06
Accession Number: 69N12005; Document ID: 19690002674; Report Number: JPL-TR-32-1262-PT-3, NASA-CR-97769