1 Space Rocks Impacts of our smallest neighbors. 2 Asteroid Belt.
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Transcript of 1 Space Rocks Impacts of our smallest neighbors. 2 Asteroid Belt.
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Space Rocks
Impacts of our smallest neighbors
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Asteroid Belt
Asteroid Belt
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The four inner planets formed, but Jupiter’s huge gravity caused
chaos in the region past Mars. No big planet ever formed there
Primitive Solar System
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Craters in the Inner Solar System
Mars’s Southern HighlandsMercury
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Impacts on Moons
Mars’s tiny moon Phobos
Mimas, a moon of Saturn
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Lunar Cratering
Our Moon shows a history of impacts
Most of these occurred long ago…
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The Asteroid Belt is Sparse
On average, there are more than 1 million km between asteroids
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DynamicCollisionsDo Occur
And the effects are seen throughout the Solar System
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Jupiter Shows Recent ImpactsThe world watched as a
comet collided with Jupiter in 1994
Possibly not as rare as we thought. Other collisions have occurred since, like
this one in 2009
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More than 170 Impact Craters on Earth
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Earth Erases History of Impacts
Wolf Creek, Australia
Roter Kamm, Namibia
Barringer Crater, Arizona
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Chicxulub and the Dinosaurs
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Recent Earth Impacts
Tunguska in Russia 1909
2008 TC3- first celestial object
tracked by astronomers before entering Earth’s atmosphere
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MeteoritesChunks of asteroids sometimes make it through
the atmosphere to the ground
These are time capsules telling us about how matter came together in the early Solar System
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Future Impacts• Meteoroids smaller than a house will
explode in our atmosphere5-10 meter objects hit about once a year
• Larger objects are rare but devastating
We don’t know when the next big impact will happen, but it will eventually
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Can we Stop an Impact?Our best chance of avoiding an impact is having advance notice of a threat
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NASA’s WISE Mission
Using Infraredtechnology to see dark asteroids WISE finds asteroids - including
some seen for the first time 100,000s of Main Belt Asteroids 100s of Near-Earth Objects
(NEOs)
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The Challenge Could be OursIf we do find an asteroid headed for Earth…