Word: crusting
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...over. More to the point, the bergs are small, rising just 300 to 600 ft. above the surrounding ice. Since only 10% of an iceberg shows above the water, that means these measure a mile or so from top to bottom--and so, therefore, does the planet-wide ice crust from which they came. On the scale of a 2,000-mile-wide moon, that's not much of a crust...
Even before Cassini's work begins and Galileo's ends, other ships could be on the way to join them in the outer solar system. NASA is tentatively planning several new Europa probes, including one that will photograph its surface and take radar soundings beneath its crust. If the radar picks up the telltale echoes of liquid water, another spacecraft would be sent to land on Europa and release a heated probe designed to melt through the ice layer and look for signs of life in the seas below...
...think Mr. Suleiman, despite his protestations, is much closer to me than he would like to admit. That possibly explains his presence at Tommy's the very night his tirade against the restaurant appeared; he apparently was enjoying a nice, fat cheese slice, with a sesame seed crust. Isn't it ironic. --Sozi Tulante Sozinho...
...less than half as large.) Its history is another. Out in deep space, a comet can get encrusted with a layer of gummy dust. This layer can seal in most of the ice and prevent it from vaporizing. Some gas may spurt out through cracks in the crust, giving a comet a premature air of greatness that amounts to not much...
...maybe the comet has been around the block too many times. The first visit loosens a comet's crust, making later go-rounds more impressive. If the comet comes through too often, however, a new crust can form out of dust falling back onto the surface. This too can lead to false optimism. "With Comet Halley, which has been back many times," says University of Texas astronomer Anita Cochran, "only about 15% to 20% of the surface is active." Admits Hale: "It's been kind of nerve-racking to sit through all those months wondering if the comet would fizzle...