During the 3 or 4 billion years that it has existed on Earth, life has been devastated, and on occasion nearly wiped out, by the explosive impact of giant asteroids or comets. Now terrestrial life has finally evolved to the point where it is intelligent and capable enough to defend itself against the next such threats from space--if it has the will to do so.
That is why some scientists are so distressed by President Clinton's line-item veto last week of the $30 million that Congress had allocated for the Clementine II project next year. Clementine is a spacecraft that was...
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