Word: earthly
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Dates: during 1970-1979
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...watch teams receive fresh telemetric data from Skylab whenever it gets within radio range of one of five NASA tracking stations (in Santiago, Chile; Bermuda; Ascension Island; Madrid; and Goldstone, Calif). On these "passes," controllers can still make small adjustments in the space vehicle's position relative to earth. This is possible for only four minutes out of every 90. Says Don McDonald, one team member: "It's 1½ hours of boredom, then four minutes of terror...
...crucial final countdown will begin when Skylab drops to about 120 miles above earth, roughly 48 hours before its re-entry into the atmosphere. At that point, a higher-level interagency team of experts, including NASA Administrator Robert A. Frosch, will take up positions in the Skylab Coordination Center on the sixth floor of NASA headquarters in Washington. Getting his information and recommendations from the Houston center, NORAD and the Marshall Space Flight "enter at Huntsville, Ala., Frosch will make the final decisions on what, if anything, should be done to try to influence Skylab's final fall...
...decision is to be made when Skylab falls to a height of about 90 miles above earth, some twelve hours before estimated reentry. At that point the controllers could use some of the 6,000 remaining pounds of fuel to rotate the craft into various nose-forward, "low drag" positions, in the hope that this would prolong Skylab's life by anywhere from one to five more orbits. By contrast, a second option would be to send the vehicle into an early tumble, which would cut from one to three orbits from its natural, uncontrolled reentry. A third option would...
...years in orbit contributed substantially to the craft's death. Russian scientists as well as America's own National Oceanic and Atmospheric Administration had predicted considerable solar disturbances, including great magnetic storms and solar flares. When they erupted in 1977 and 1978, they warmed the gases in the earth's outer atmosphere, increasing the drag on Skylab. Never fully powered because of its lost solar wing and failing batteries, the craft began to slip ever closer to earth...
...about 80,000 feet and then blast Skylab out of the sky with a non-nuclear rocket. This idea was dropped when the scientists concluded that Skylab would merely be blown into more pieces scattered over a wider area, increasing rather than reducing the danger of damage on earth...