Logo and link to NASA's Homepage. Comet Body and NASA Ames Logo Comet's Head
David Morrison
Asteroid and Comet Impact Hazards title
skip navigation links 2/13/2013
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Massive Terrestrial Strike

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Artist's concept of a catastrophic asteroid impact with the early Earth. An impact with a 500-km-diameter asteroid would effectively sterilize the planet. The Earth may have experienced such gigantic impacts in its youth, but fortunately today there are no projectiles this large to threaten our planet.

Artist: Don Davis (No Copyright - see NASA "USE" policy)

 

Dino Killer

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A large body of scientific evidence now exists that support the hypothesis that a major asteroid or comet impact occurred in the Caribbean region at the boundary of the Cretaceous and Tertiary periods in Earth's geologic history. Such an impact is suspected to be responsible for the mass extinction of many floral and faunal species, including the large dinosaurs, that marked the end of the Cretaceous period. Until now, the remains of such an impact crater have escaped detection. The geohydrological feature (Cenote Ring) of Northwestern Yucatan, was discovered through NASA Ames Remote Sensing technology, and represents a prime candidate for the impact site of a global catastrophic event.

Artist: Don Davis (No Copyright - see NASA "USE" policy)

 

Nature Remodels the Coastline

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Artist: Don Davis (No Copyright - see NASA "USE" policy)



Animations

Peekskill Meteorite

(1993). MPEG (996kb)

Artist: Don Davis (No Copyright - see NASA "USE" policy)