| 1. | The most likely cause for this to happen are impact events.
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| 2. | Impact events have been a plot and background element in science fiction.
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| 3. | Many impact events occur without being observed by anyone on the ground.
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| 4. | This sort of behaviour follows accurately to current understandings of impact event.
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| 5. | He undertook extensive research to make the pending impact event scenario realistic.
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| 6. | The Tunguska event is the largest impact event on Earth in recorded history.
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| 7. | By contrast, megatsunamis are caused by giant landslides and other impact events.
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| 8. | Two of the largest known impact events on Earth occurred during the Orosirian.
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| 9. | Such impact events occur on average around once per 10, 000 years.
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| 10. | This could happen during impact events on the surface of the parent body.
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