Word: origine
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...mission was to collect any debris that might still be adrift after the fireball's searing entry into the earth's atmosphere. For the second time in history, investigators had been alerted quickly enough to seek such dust, which provides invaluable clues to the origin and chemical makeup of meteorites...
...constant bombardment by micrometeorites and solar particles, Gold calculates that the event was relatively recent-perhaps less than 30,000 years ago. It probably lasted only ten to 100 seconds. The small craters show the effect of the blast because they are natural heat traps. What was the origin of this fiery outburst, which Gold figures was 100 times more powerful than ordinary sunlight? Writing in the current issue of Science, Gold speculates that it came from the sun itself, possibly as the result of a collision with a large comet...
...Southern high school, for example, solicited reports from two teachers. "I believe he is a deserving student," one wrote. The admissions committee reads that 10,000 times a year, Peterson says, and "it's hard to keep listening." The other teacher wrote, "Despite his humble and low-class origin, it is clear that he has somehow developed the manners and behavior of a young gentleman." The boy was admitted, despite an academic rating...
...Earth. Though the Lunar Receiving Lab's examination will continue until the rocks are released from quarantine this month, it has not yet answered any of the basic questions about the moon's origin. But if the moon is actually proved never to have had a molten interior (the maria melting could have been caused by meteor impacts), scientists would be hard put to sustain one of the theories of the moon's creation: that it was torn, cataclysmically, from a hot earth. On the other hand, a cold moon does not upset either...
Urey himself believes that if the moon does indeed prove to be "cold," its virtually intact primordial surface may provide not only important clues about the moon's beginnings but also about the origin of the solar system. The most ancient rocks found on earth are 3.3 billion years old, or more than a billion years younger than the planet itself, and the moon rocks from the Sea of Tranquillity are about the same age. Nonetheless, Urey and other cold-moon proponents think that when men reach the lunar highlands, which are generally considered to be older than...