Word: occurance
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Dates: during 1980-1989
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...1950s, astronomers realized that most of the universe's 90-odd elements, or types of atoms, had been "cooked" not at the moment of the universe's explosive birth but inside the hot furnaces of subsequently formed stars in fusion processes similar to those that occur when a hydrogen bomb detonates. But as they gazed out upon the heavens with their telescopes and spectrometers, astronomers found that the composition of stars varied enormously, containing different atoms and in different proportions...
Work on the exterior will begin as early as next summer, Simpson said, and interior reconstruction should occur during the summer of 1985, so that it does not interfere with classes...
...full board will address "general university conditions" that may be allowing harassment to occur on campus, Carol Christ, faculty assistant to the chancellor, said...
Thomas' plan has a low probability; scientists rarely speak of absolute impossibilities. One of the author's keenest pleasures is describing phenomena that should not occur: a species of bacteria that thrives on temperatures of more than 300° C or a type of virus that propagates vigorously even though it does not contain any detectable genetic material...
Last month the Sandinistas made a concession by announcing legislative approval of a law recognizing that opposition political parties could be formed with the goal of "achieving political power." How that might occur is still unclear; the Sandinistas have promised to hold elections by 1985, but so far they have not determined the stakes in the race, or even the election rules...