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- <text id=91TT1452>
- <title>
- July 01, 1991: Saving the Planet
- </title>
- <history>
- TIME--The Weekly Newsmagazine--1991
- July 01, 1991 Cocaine Inc.
- </history>
- <article>
- <source>Time Magazine</source>
- <hdr>
- SCIENCE, Page 61
- Saving the Planet
- </hdr><body>
- <p> What are the chances that much of life could once again be
- snuffed out by a collision with an icy comet? Rather small, but
- there are plenty of asteroids in the heavens capable of causing
- devastation. Astronomers have identified more than 130 asteroids
- whose paths could intersect earth's orbit. Consisting largely
- of rock or iron, some are over a mile wide and could ram the
- earth at 65,000 km (40,000 miles) per hour. The odds of a strike
- within the next 50 years are probably less than one in 10,000.
- But whenever it does happen, the explosion could dwarf a nuclear
- bomb blast.
- </p>
- <p> Until the space age, earthlings had no defense against
- such a threat. But now astronomers can determine years in
- advance if an asteroid will hit the earth. In theory, a nuclear
- missile could then be launched to rendezvous with the intruder,
- explode nearby and nudge it into a safe path. NASA, which spends
- under $1 million a year watching for collisions, will be a
- sponsor of the first International Conference on Near-Earth
- Asteroids next week in San Juan Capistrano, Calif., and is
- planning a seminar this year on asteroid avoidance. Still, the
- threat of a sneak attack remains. In 1989 a 250-m-wide (820 ft.)
- asteroid was discovered only after it had missed the earth by
- an astronomical eyelash -- less than 804,500 km (500,000 miles).
- </p>
-
- </body></article>
- </text>
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