Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983sci...219..803h&link_type=abstract
Science, vol. 219, Feb. 18, 1983, p. 803-808.
Physics
2
Mars (Planet), Postmission Analysis (Spacecraft), Space Exploration, Space Missions, Viking Spacecraft, Mars Atmosphere, Mars Photographs, Soil Science
Scientific paper
The two Viking spacecraft launched to Mars in 1975 were designed for 90 days of intense observations followed by an extended mission phase to end in 1978. Because the spacecraft were still operating so well in 1978, three more mission phases were added and the project was not officially terminated until 1980. During these last three mission phases delays in controlling the orbiters from the earth increased. The spacecraft were kept functional and the length of the Viking mission was extended because the ground crew, over a period of 2 years, gradually made the orbiters autonomous.
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