Word: dusts
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Dates: during 1970-1979
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...there was much less concern about the local weather than about conditions on Mars, some 80 million miles away. As scientists monitored the pictures and scientific data being transmitted from Mariner 9, in its second week in orbit around the distant planet, Mars was still enshrouded in a raging dust storm. While apparently beginning to subside, the giant duster will probably obscure much of the surface for weeks to come. Faced with the growing possibility that the Martian skies will not clear up completely during Mariner's planned three-month photography mission, JPL controllers fed a new temporary "shooting...
That improvisation quickly produced rewards. Mariner found an opening in the dust clouds near the south polar cap and managed to get another look at an area that had been marked by long, frost-covered ridge lines and craters during the flybys of Mariners 6 and 7 in 1969. To the surprise of scientists, the pictures showed that the ridge lines were no longer covered by frost, many craters had vanished entirely, and the surface was remarkably smooth. Said Astronomer Bradford Smith: "This whole area looks like it's been planed off." Some scientists speculated that the most logical...
...among the worst in the U.S. even on good days, but last week really dramatized the reason for the doctors' concern. On Monday night an atmospheric inversion settled over the city. The sky turned reddish-brown, as clouds of ash, soot, and foundry dust produced by the city's factories were trapped beneath. By Tuesday, the pollution level had risen to 771 micrograms of particulate matter per cubic meter of air, nearly four times the level considered safe by the Environmental Protection Agency...
...doesn't peek, she waggles a finger. And it's not a novel, even if the dust jacket says it is; it's a wadded-up ball of short stories...
...miles, stored the images on tape, and then, on commands from mission control, transmitted them back home (the signals, traveling at the speed of light, took 6½ minutes to reach earth). The early images were somewhat disappointing. Because much of Mars is shrouded by a raging dust storm that began last September, only a few features could be picked out. But the scientists were not top concerned. The storm is expected to die down within a few weeks, and if Mariner's systems continue working well, the spacecraft will take some 5,000 pictures over the next three...