By John G. Taylor
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This is very uncertain, but if it happened, the location on Mars of any debris is unknown, as is the landing site targeting strategy for the mission. 18 July 1965: Zond 3 (Soviet Union) Zond 3 was similar or identical to Zond 2, but a delay meant that it missed its 1964 launch window to Mars. Instead it was launched as a technology test vehicle and passed the Moon to image part of its far side, which had not been seen previously. 4 minutes. It was injected into a heliocentric orbit which intersected the orbit of Mars, but at a time when Mars was far from that point.
A Boeing plan for a large nuclear rocket to send crews to Mars or Mars and Venus between 1978 and 1998, with various mission designs lasting between 460 and 900 days. North American Rockwell described a lander which could ﬂy in 1982, a light version putting two people on Mars for four days, a heavier version placing four people on Mars for 30 days. NASA’s Space Task Group described a mission involving nuclear rockets, with twin 1981 launches and 1982 Mars orbit operations. During two days in orbit, the crew would select landing sites for 12 robotic sample return probes.
Darkening from north can be seen in 1975. Wave of darkening present but waning; also see 1969 comments. Reported seasonal colour changes, crossing linear features. Alternative: see 1969, candidate for successive landings at one site. Alternative: changes reported, darkening via Hellespontus channel? 1973. Primary Objectives: Deserts and Canals. Two Landers. Propontis Elysium 45° N, 185° W 25° N, 210° W Hellas Nix Olympica Ismenius 40° S, 290° W 20° N, 130° W 40° N, 330° W Typical ‘canal’, striking changes, edge of desert hemisphere.