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From Science News
NEW THEORY ON DINOSAURS: MULTIPLE METEORITES DID THEM IN
from The New York Times
For more than a decade, most scientists have believed that the
of the dinosaurs was caused by a single event: the crash of an immense
from outer space, its explosive force like a hundred million hydrogen
bombs, igniting firestorms and shrouding the earth in a dense cloud of
that blocked sunlight and sent worldwide temperatures plummeting.
The theory gained wide acceptance in 1991, after the discovery of a
buried under the tip of the Yucatán Peninsula. The giant gash
miles from rim to rim, and its age was found to be 65 million years,
same time as the death of the dinosaurs.
Now, however, scientists working in Ukraine have discovered that a
known but smaller crater, some 15 miles wide, had been inaccurately
and is actually 65 million years old, making the blast that created it
likely contributor to the end of the dinosaurs.