| http://www.w3.org/ns/prov#value | - ne-week warning for a 50-yard (45-metre) diameter asteroid known as a city killer and three weeks for a 150 yard (137 meter)-diameter county killer.he is enough time to evacuate the area of people, take measures to protect buildings and other infrastructure, and be alert to a tsunami danger generated by ocean impacts, said astronomer John Tonry.Russian experts said, however, that constructi
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