Word: dust
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Dates: during 1990-1999
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...systems chief engineer, dubbed "The Little Rover That Could." Having inched its way down the steeply inclined lander ramp, the six-wheeled Sojourner crept gingerly onto the Martian surface early last week and, in its first official scientific experiment, shoved the nose of its X-ray spectrometer into the dust at the foot of the lander...
...long-dry valley. But there was a planet more than 100 million miles away filled with people who were paying heed when it landed, appropriately enough, on July 4. For the first time in 21 years, a machine shot from Earth once again stirred up the Martian dust. More important, for the first time ever, it was going to be able to keep stirring it up well after it landed. Curled up inside Pathfinder like a mechanical kangaroo joey was Sojourner, a 1-ft.-tall, 2-ft.-long robot car, known as a rover, designed to trundle away from...
...Immediately after that, a cluster of retrorockets fired for a quick 2-sec. burst, applying a final brake. The almost comically balloonlike ship then struck the surface at about 22 m.p.h., bounced as high as 50 ft. and finally came to rest somewhere in the 4.6 billion-year-old dust...
...make time for a series of rearguard actions against the deal. He has dogged the heels of state bureaucrats to block Mettiki and its coal-carrying trucks from getting what the union miners consider regulatory breaks. He protested when the state issued new permits to allow for airborne dust generated by more truck traffic to the power plant; he protested when the state granted permission for Mettiki to use a private haul road, and he protested when it increased weight limits on public highways for the mine's trucks. Along with several state legislators and environmental groups, Leone...
...reviewed 86 separate studies about the association between soot and dust particles and human illness. The agency was already thinking about tightening its rules on ozone, a noxious form of oxygen produced in the burning of fossil fuels. (Another fossil-fuel combustion by-product, carbon dioxide, is a greenhouse gas, responsible in large part for the phenomenon of global warming.) It reviewed an additional 186 studies on ozone, making this, according to Browner, the most extensive scientific review undertaken for any air standard the EPA has proposed...