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19 Cards in this Set
- Front
- Back
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When was the earth created |
4.5 billion years ago |
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Nebular hypothesis |
He origin of the solar system could be traced to a rotating cloud of gases and fine dust |
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Solar nebula |
A disk of gases and dust |
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Planetesimals |
Dust and condensing material to clump together into small kilometer sized chunks caused by gravitational attraction |
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Terrestrial planets |
Four inner planets Most volatile material boiled away |
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Meteorites |
Chunks of material from outer space that strike earth |
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Comets |
Dust and ice |
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Gravitational differentiation |
The transformation of random chunks of primordial matter into a body whose interior is divided into concentric layers that differ from one another both physically and chemically |
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Heavy bombardment |
Planets collide frequently with the residual materials that still cluttered the solar system after they had been assembled |
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Coronae |
Fallen lava soufflé on Venus |
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Flake tectonics |
Crust breaks up into flakes or crumples like a rug, lava bubbles up to form land masses and volcanic deposits On Venus Possibly on earth in past |
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March 2880 |
Asteroid collides with earth killing everyone |
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Four missions to Mars |
Flybys Orbiters Landers Rovers |
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Mariner and Viking missions did what |
Returned with detailed images of Mars |
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What did the pathfinder do |
Images of Mars, evidence of andesites, collected dust from atmosphere, environment low in oxygen |
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Global surveyor did what |
Martian topography Evidence of liquid water flowing Minerals required liquid water Permafrost |
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Spirit and opportunity |
Rovers on Mars that analyzed the rocks Robotic geologists |
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Cassini-Huygens mission |
2005 most ambitious mission traveled over a billion kilometers in almost 7 years through the rings of Saturn to Titan a moon on saturn |
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Exoplanets |
Planets that lie outside the solar system |
