Term
| The sun is __% of the total mass of the solar system. |
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Definition
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Term
| The planets all orbit the sun in the ______ direction. |
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Definition
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Term
| The orbits of the planets (excluding ______) all lie in a thin plane. |
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Definition
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Term
| Pluto's orbit is drastically _____ relatie to the planets' orbits. |
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Definition
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Term
| Venus' rotation differs because |
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Definition
| Retrograde motion, very slowly |
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Term
| Uranus' rotation differs because |
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Definition
| It is tipped on it's side |
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Term
Giant molecular clouds are made of dense concentrations of __, __, ____ and ____.
(Star Formation) |
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Definition
| H2, CO, dust, other molecules |
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Term
| A collapsing gas cloud forms a _____ ______. |
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Definition
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Term
| Collisions of atoms convert kinetic energy to ____. |
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Definition
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Term
| Light carries away ____, nebula gets _____, contracts because of ______. |
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Definition
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Term
| Angular momentum cannot collapse in direction ______ to spin axis disk. |
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Definition
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Term
| The terrestrial planets include |
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Definition
| Mercury, Venus, Erath, Mars |
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Term
| The giant (Jovial) planets include |
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Definition
| Jupiter, Saturn, Uranus, Neptune |
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Term
| Terrestrial planets are small and rocky and are made of _____, _____, _____, etc. |
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Definition
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Term
| Giant (Jovian) planets are large, primarily gas, ice, and liquid, and are made of _____ and _____. |
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Definition
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Term
| The solar system is mostly ____ and ____. |
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Definition
| Hydrogen (75%) and Helium (23%) |
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Term
| The composition of the Jovial planets are |
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Definition
| Ice and rock at the core, helium gas and hydrogen on top |
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Term
| Process of forming the planets: |
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Definition
| Gas cloud collapses, forms spinning disc. Dust grains condense, comet asteroids form. Proto-planets form (Mars-sized objects). Final planets form, solar wind blows away remaining gas. |
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Term
| The interior of the earth is composed of: |
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Definition
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Term
| Earth's crust is _____ thick under oceans, _____ thick under continents. |
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Definition
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Term
| The mantle of the Earth is composed of |
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Definition
| Slowly flowing semi-solid rock |
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Term
| The Earth's core is ______ in diameter. |
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Definition
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Term
| The Earth's outer core is ____, the inner core is probably ____. |
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Definition
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Term
| Plate tectonics drift around |
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Definition
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Term
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Definition
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Term
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Definition
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Term
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Definition
| One plate slides alongside another |
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Term
| The Earth's atmosphere is made of __% ____, __% ____, ____, ____, ____, etc. |
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Definition
| 78% nitrogen, 21% oxygen, argon, H2O, CO2 |
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Term
| ____ (O3) is critical for life |
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Definition
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Term
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Definition
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Term
| Highlands on the moon are |
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Definition
| Low density rocky slag formed on top of molten Moon |
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Term
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Definition
| Huge lava flows from vaolcanoes |
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Term
| The Moon's crust is ____ thick on the nearest side to Earth, ____ thick on the farthest side. |
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Definition
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Term
| The Moon is ____ in diameter. |
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Definition
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Term
| Most maria are on the side ____ to Earth. |
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Definition
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Term
| Mercury is expected to be _____ thick. |
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Definition
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Term
| The surface pressure of Venus is ___x that of the Earth's |
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Definition
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Term
| There are tectonic plates on Venus. T/F |
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Definition
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Term
| The atmosphere of Mars is |
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Definition
| Little air, very cold, almost no liquid water, no greenhouse effect, low atmospheric pressure |
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Term
| The cores of the Jovian planets are __-__x more massive than Earth |
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Definition
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Term
| Jupiter has __ known moons, including the Galilean moons ____, ____, ____, and ____. |
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Definition
| 63, Io, Europa, Ganymede, Callisto |
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Term
| Saturn's rings are composed of ___ and are about ___ thick. |
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Definition
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Term
| The Asteroid Belt is located between ____ and ____. |
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Definition
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Term
| The approximate age of the solar system is |
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Definition
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Term
| Comets have a ____ ____ ____. |
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Definition
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Term
| Outer layers of comets vaporize when comets approach ___ ___. |
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Definition
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Term
| The head of the comet is often as large as ____. |
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Definition
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Term
| Hydrogen clouds around the head of the comet can get bigger than ___ ___. |
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Definition
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Term
| Dust tails of a comet can be up to ____ long, while ion (plasma) tails of a comet can be ____ long. |
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Definition
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Term
| Halley's Comet was first observed in |
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Definition
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Term
| Halley's Comet has a __ year average orbital period. |
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Definition
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Term
| THe 2 sources of comets are: |
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Definition
| The Oort Comet Cloud and the Kuiper Belt |
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Term
| The Kuiper Belt lies just beyond ____. |
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Definition
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Term
| The composition of a comet is: |
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Definition
| Silicates, Carbon, 75% empty space, very low density |
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Term
| Meteor showers are the result of: |
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Definition
| Earth passing through a trail of debris from an old comet. |
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