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28 Cards in this Set
- Front
- Back
- 3rd side (hint)
1.4 million km |
Diameter of sun |
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Chamberlin-Moulton Jean-Jeffreys Kant-Laplace or ___________________ |
3 Hypotheses on creation of solar system |
Modern Nebular Theory |
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Chamberlin-Moulton |
Hypotheses: Collision of stars Materials:_______________ |
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Jean-Jeffreys |
Hypothesis: Near collision with star Materials: ________________ |
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Refractory Materials |
Very high melting and condensation temp. Tend to _________ except at very ______ temp. E.g. __________ and ________ |
Solid; high Metals and silicates (rocks) |
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Volatile Materials |
Very low melting and condensation temp. Tend to be _________ (or ________) unless in very ____ temp. E.g. _____ __ _________, _________, _____, ____________ |
Gases or liquids; low Ices of water, ammonia, CO2, Nitrogen |
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Accretion (__________) → Heating and Melting → Core formation → Cooling and crust formation (____________) → Geological Activity |
Planetary Formation |
4.5 BY ago; 3.5 BY ago |
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#1 In orbit around the sun #2 Has sufficient mass for its self-gravity to overcome rigid body forces and to assume a state of hydrostatic equilibrium (nearly round) shape #3 Has cleared the neighborhood around its orbit |
_______ said in a statement that the definition for a planet is officially known as a "_________ _______" that: |
IAU; Celestial body |
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Terrestrial Planets |
Made up of rocky materials with high densities; All light gaseous materials were driven off; Examples: ______________ |
Mercury, Venus, Earth and Mars |
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Partial Melting Distance from the sun Presence or absence of biosphere Volcanism |
Factors in the Evolution of TP |
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Asteroid belt |
Rocky fragments that failed to join together to make a planet (too small) |
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Asteroids |
Minor 'planets' or rocky metallic bodies |
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Asteroids |
Material that failed to form a planet; Influenced by gravitational pull _____________- nearest _____________- farthest |
Apollo Trojan |
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NEO |
Comets and asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter the Earth's neighborhood (w/in ___ all of the sun) |
Near Earth Object |
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NEO Program |
NASA everyday keeps watch for NEOs |
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Jovian Planets |
Planets and moons farther away from the sun |
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Jovian Planets |
Made up of light, gaseous materials with low densities such as sulfur-bearing compounds, water, ice and methane ice ____, ____, _____, and ______ exist as frozen compounds |
CH4, NH3, H20 and H2S |
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Comets |
Are like large dirty snowballs, made up of rocks and dust held together by ______ and ________ ____ |
Ice and frozen gas |
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Dust and dirt to form a curved ______ _____ Liberated gases glow producing _______ (luminous envelope surrounding solid core) Ionized by the sun's radiation and pushed backwards by solar wind, the heated gas trails behind and also glows, forming a ____________________ |
Comets icy layers evaporate near the sun releasing ... |
Dust tail Coma Straight ionized gas tail |
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Kuiper Belt, Scattered Disc, and the Oort Cloud Orbit _____________ away Gravitational influence |
Comet Origins |
10 billion mi |
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Meteoroids |
Left behind by an asteroid or comet; Grain of sand to a meter wide |
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Meteors |
Visible streak of light caused by an object such as a meteoroid, asteroid or other space debris that enters the Earth's atmosphere |
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Meteorites |
Pieces of rocky, metallic debris that actually collide with the Earth; small impacts are common 3 TYPES: _________ _________ _________________ |
Stony Iron Stony-Iron |
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Potentially hazardous objects |
NEOs pass close enough to Earth amd size large enough to cause significant regional damage in impact MOID ___________________ Diameter _____________________ |
<0.05 AU - 7.5 M km 300 - 500 ft |
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TNO |
KBO, SDO and Centaurs Gravitational interaction with Jovian planets disturbed its orbit bringing it ★the orbits of the gas giants |
Trans-Neptunian Objects |
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Centaurs |
"Refugees" from KB or SD (thus have become cis-Neptunian objects) |
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Around ________________ Large asteroid fell at ________________ |
Asteroid Theory on Dinosaur Extinction |
66 million years ago Yucatan Peninsula at Chicxulub, Mexico |
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Asteroid Theory |
Just study this |
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