| 1. | The impactor returned images as late as three seconds before impact.
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| 2. | The impactor is estimated to have been about 100 m in diameter.
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| 3. | The basic idea is simple : The impactor carries a given momentum.
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| 4. | Many craters look as if the impactor fell into mud.
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| 5. | A 700-meter impactor would create around a crater.
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| 6. | The impactor is estimated to have been about 200 500 meters in diameter.
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| 7. | Three secret 1958 attempts to launch impactor probes failed.
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| 8. | The impactor is considered to have been a stoney meteorite about in diameter.
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| 9. | To stop the impactor, this momentum must be transferred onto another mass.
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| 10. | :It was the Chicxulub _ impactor that heavily contributed to dinosaur extinction.
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