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Since 1973, Shoemaker has been photographing the sky in search of asteroids that periodically cross the earth's orbit and thus pose the danger of a collision. To date, he says, 57 such asteroids at least 1 km (.62 mile) in diameter have been cataloged. In addition, about three earth-crossing comets are detected each year. From the rate at which new earth crossers are discovered, Shoemaker estimates that there are some 2,000 asteroids in this category and that 100 comets intersect the earth's orbit every year...
...form of pebbles or small rocks, but occasionally they are much larger. Scientists think it was a 130-ft. hunk of meteoric iron that hit Arizona with a force of 15 megatons between 20,000 and 50,000 years ago, digging a crater three-quarters of a mile across and 600 ft. deep...
...following year, he was the first New England collegian to break the four-minute mile mark outdoors, with a time...
Domanyuk gave no indication that the estimated 25,000 residents of Prepay, who are among 92,000 people evacuated from an 18-mile zone around the Chernobyl plant, would be returning home when the two reactors start up in the fall...
Perhaps the most ubiquitous form of plastic trash is the tiny polyethylene pellets used in the manufacture of plastic items. In one survey, researchers calculated that, on average, a square mile of the Sargasso Sea, southeast of Florida, contained between 8,000 and 10,000 bobbing pellets. Says Al Pruter, a fishery biologist and partner in a Seattle-based natural- resources consulting firm: "Almost without exception, surveys show plastic to account for over one-half the man-made products on the ocean surface...