Word: crusts
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Dates: during 1970-1979
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Then it moved on to Ganymede, photographing a tortured, cratered sphere whose cracked and faulted icy crust may indicate moonquakes. It took a closer look at Europa, which revealed an intricate lattice work of veinlike lines that may represent shallow fissures in an icy sea. Finally, Voyager 2 shifted its electronic gaze to lo, the innermost and most spectacular of the Galilean moons. Four months ago, Voyager 1 had spotted eight volcanoes in the midst of eruption, the first time such activity was observed other than on earth. Last week its successor photographed six of the same eruptions, suggesting...
...influence climate, and possibly allow more cosmic radiation to assail the earth's atmosphere. One layer, only a centimeter thick and tracing back 65 million years, showed a sharp excess of iridium, an element 1,000 times more plentiful in otherworldly matter than in the earth's crust. The "spike" in the readings made a sobering point. "It's the first experimental evidence that something quite extraordinary happened then," says Physics Nobel Laureate Luis Alvarez, who gave his son a helping hand. A supernova that could have wiped out the dinosaurs? "A very small probability," says Alvarez...
...more hedonistic pleasures. Falling in with a tribe of long-haired dropouts, he soon discovers countercultural drugs and politics. Thanks to a whimsically funny plot twist, he also falls in love with Sheila (the voluptuous but innocent Beverly D'Angelo), a debutante he gallantly rescues from the upper-crust sobriety of Short Hills...
...photographs of Callisto, darkest and outermost of the Galilean moons, showed that this gloomy sphere may be at least half water. Ganymede also seems watery, but appears to have an ice crust and possibly a mud core. Remarkably, both moons are dotted with dark spots that some scientists are tentatively calling ice volcanoes-craters that spew ice instead of fire and lava. Still closer to Jupiter, Europa apparently hides a rocky core beneath its bright icy surface...
Skimming down a steep, snow-covered road at Camp David in Maryland's lovely Catoctin Mountains, Jimmy Carter was enjoying the brisk air of an afternoon in the woods when the tip of one of his thin skis caught beneath a crust of rough ice. The President of the United States went down hard. The consequences of this tumble were clearly visible when he returned to snow-paralyzed Washington the next day: an ugly purple bruise the size of a silver dollar over his right eye, several bright red scratches on his cheek, a puffy lip and a slight...