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... , and mechanism of radiation processes. In Mars orbit spacecraft had investigated Mars solar wind flow and its interaction with Mars ionosphere, recorded spectrum of charged particles and ... 1971 November December 1971 December Dec 1 1971 1 Dec 2 1971 2 Dec 3 1971 3 Dec 4 1971 4 Dec 5 1971 5 Dec 6 1971 6 Dec 7 1971 7 Dec 8 1971 8 Dec 9 1971 9 Dec 10 1971 ...

... announced. At 6:00 am Moscow time June 8 (11:00 pm EDT June 7) Mars 2, launched May 19, had completed 14 communications sessions and was 4 897 000 km ( ... 1971 May June 1971 June Jun 1 1971 1 Jun 2 1971 2 Jun 3 1971 3 Jun 4 1971 4 Jun 5 1971 5 Jun 6 1971 6 Jun 7 1971 7 Jun 8 1971 8 Jun 9 1971 9 Jun 10 1971 10 Jun 11 1971 11 Jun 12 1971 12 Jun 13 1971 13 Jun 14 1971 14 Jun 15 1971 15 Jun 16 1971 16 ...

... 10-11: Mariner 9 (launched by NASA May 30) began taking preorbit science photos of Mars, showing planet as featureless, halfmoon-like object, hazy and dust-covered. First photos, taken over ... 1971 October November 1971 November Nov 1 1971 1 Nov 2 1971 2 Nov 3 1971 3 Nov 4 1971 4 Nov 5 1971 5 Nov 6 1971 6 Nov 7 1971 7 Nov 8 1971 8 Nov 9 1971 9 Nov 10 1971 ...

... Infrared spectrometer had measured reflected radiations that suggested wide range of rock compositions on Mars surface, varying from high in silicon and oxygen to low. Spectrometer had also ... 1971 October November 1971 November Nov 1 1971 1 Nov 2 1971 2 Nov 3 1971 3 Nov 4 1971 4 Nov 5 1971 5 Nov 6 1971 6 Nov 7 1971 7 Nov 8 1971 8 Nov 9 1971 9 Nov 10 1971 ...

... 's magnetic tail farther out in space than previously reported, Pravda article said. Both Mars 2 and Mars 3 had passed through area 19 million km (12 million mi) from earth, where ... 1971 November December 1971 December Dec 1 1971 1 Dec 2 1971 2 Dec 3 1971 3 Dec 4 1971 4 Dec 5 1971 5 Dec 6 1971 6 Dec 7 1971 7 Dec 8 1971 8 Dec 9 1971 9 Dec 10 1971 ...

... orbits," Tass announced. To date, 153 radio communication sessions had been held with Mars 2 and 159, with Mars 3 ''(FBIS-Sov-71-241)'' USAF's X-24A lifting body was shipped ... 1971 November December 1971 December Dec 1 1971 1 Dec 2 1971 2 Dec 3 1971 3 Dec 4 1971 4 Dec 5 1971 5 Dec 6 1971 6 Dec 7 1971 7 Dec 8 1971 8 Dec 9 1971 9 Dec 10 1971 10 Dec 11 1971 11 Dec 12 1971 12 Dec 13 1971 13 Dec 14 1971 14 Dec 15 1971 15 Dec 16 1971 16 ...

... been delayed while Soviet scientists investigated interruption of TV transmission from capsule dropped on Mars by Mars 3 Dec. 2. Message did not state cause of interruption or whether ... 1971 November December 1971 December Dec 1 1971 1 Dec 2 1971 2 Dec 3 1971 3 Dec 4 1971 4 Dec 5 1971 5 Dec 6 1971 6 Dec 7 1971 7 Dec 8 1971 8 Dec 9 1971 9 Dec 10 1971 ...

... Jet Propulsion Laboratory JPL and Moscow of in-formation from U.S. and Soviet Mars probes. NASA requested more information on Soviet experiments and spacecraft on "detailed level .. ... 1971 November December 1971 December Dec 1 1971 1 Dec 2 1971 2 Dec 3 1971 3 Dec 4 1971 4 Dec 5 1971 5 Dec 6 1971 6 Dec 7 1971 7 Dec 8 1971 8 Dec 9 1971 9 Dec 10 1971 ...

... begun in 1969, was to "maintain nearly continuous photographic surveillance of Mars, Jupiter, and Venus during favorable periods." Mars weather seemed analogous to weather in arid regions of earth. ''( ... 1971 May June 1971 June Jun 1 1971 1 Jun 2 1971 2 Jun 3 1971 3 Jun 4 1971 4 Jun 5 1971 5 Jun 6 1971 6 Jun 7 1971 7 Jun 8 1971 8 Jun 9 1971 9 Jun 10 1971 ...

... photo. Successful photo of Phobos would have shown greater detail than recent picture of Deimos, Mars' other moon, since Phobos was twice as large as Deimos and spacecraft passed 1600 km ... 1971 October November 1971 November Nov 1 1971 1 Nov 2 1971 2 Nov 3 1971 3 Nov 4 1971 4 Nov 5 1971 5 Nov 6 1971 6 Nov 7 1971 7 Nov 8 1971 8 Nov 9 1971 9 Nov 10 1971 ...

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