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| 1992- thought they found 10th planet |
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30-50 AU, small icy bodies orbiting sun
AKA trans neptunian objects
or edgeworth kuiper objects |
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| What is a planet? 2006 4 characterisitcs |
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Definition
orbits sun
spherical shape
cleared neighborhood around orbit
not a satelite
so mvemjsun |
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| rocks, dust, icy dirty snowball, low density |
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| comet parts- coma, nucleaus, ion tail, dust tail |
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nucleaus- CHON particles, silicate mineras, mizture of 1st and second type.
ion tail- ions shooting off from sun
dust tail |
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chondrites
iron
stoney iron
achondrites |
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comets originate at edge of solar system
Epik and Oort |
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| Estonian astronomer. 1932--comets originate at edge of solar system |
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| Dutch Astronomer 1950- reporoposed the idea of cometry |
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-oldest material, represent bulk composition of solar system
-undiferentiated *****( only one)
-contain chondrules, CAI's, and metal grains (Fe Ni) |
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| 5 things that make up the solar system |
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| Lightest to heaviest Volatiles- (atmosphere) CAIs- Calciaum A Ti rich (crust) Chondrules- Fe Mg rich silicates (mantle) Metal grains Fe N S (core) |
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| Fe Ni rich --- blown up differentiated core |
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| basket weave when acid etching iron meteroite --used to calcualte cooling rate |
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igneous (achondrites/ stoney irons/ FE's)
Sedimentary (chondrites)
Metamorphic (chondrites) |
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| melting then crystalization (can represent differentiation) |
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| chem or physical weathering particles that are compressed together |
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| increase in temp pressure and sometimes add volatiles |
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| found 4 vesta (2nd largest asterioid in solar system) |
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| foudn 1 ceres (largest asteroid considered a dwarf planet) |
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howardites, euchrites, diogenites
respectively crust, mantle, mix |
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| Requiorements for life (5) |
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| proteins, carbs, eucleic acids, water , lipids |
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| kirtwood gaps (where jupiter ejected asteroids) |
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| small bodies outsie solar system |
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