| 11. | It is estimated to be caused by an impactor 3 to 5 meters long.
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| 12. | Delay exploits the fact that both the Earth and the impactor are in orbit.
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| 13. | The dark component may be residual material from the impactor that formed the crater.
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| 14. | Lofn was probably formed by an oblique impactor coming from the north-west.
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| 15. | The impactor, as well as the surface it hits, can undergo temporary liquefaction.
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| 16. | The energy released by an impactor depends on diameter, density, velocity, and angle.
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| 17. | The final image taken by the impactor was snapped only 3.7 seconds before impact.
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| 18. | When a high-velocity impactor.
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| 19. | The U . S . exploration of the Moon began with the Ranger 4 impactor in 1962.
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| 20. | It is believed that about half of the impactor's bulk was vaporized during its descent.
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