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| the solar system consists of |
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| sun, system of planets, asteroids, comets |
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| planets are divided into two classes |
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| mercury, venus, earth, mars |
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| jupiter saturn uranus neptune |
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| theory that the sun and planets formed together from a cloud of gas and dust- a nebula |
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| gravity between materials in the clouds pulled it inward, then spinning like a disk |
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| the center of the disk is the |
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| away from the center ____ formed |
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| ___ accreted more matter to become planets |
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| nearest star to the earth |
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| sun is composed mostly of |
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| hydrogen in the plasma phase |
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| the sun: ____of mass are converted to energy each second |
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| orbital speeds of the planets around the sun ____ with increasing distance from the sun |
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| closest to sun;barely bigger than our moon; almost no atmosphere |
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| 2nd closest; diameter .95 of earth; v dense atomospere; volcanically active; harsh place |
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| 4th planet from sun; little more than 1/2 earths size; thin atmosphere (95% Co2,.15% O2) |
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| a planet with a thin/dense atmosphere is ineffective in reducing the temp difference btw day and night |
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| thin (like mercury and mars) |
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| gaseous; low density; larger than earth; |
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| more than 11 times earths diameter; more liquid than gaseous or solid; atmospheric pressure more than million times that of earhs |
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| planet where no definite surface occurs on the inner rocky planet |
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| whats special about jupiters moon europa |
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| has an ice-capped ocean which may hold extraterrestrial life |
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| lowest density of all planets |
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| saturn (less than that of water) |
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| saturns ring hypothesized to be: |
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| moons that never formed or remnants of a moon torn apart by tidal forces |
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| 98 degree tilt to the orbital plane; faint rings; methane; v cold |
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| highly elongated elipitcal path about the sun; mainly hydrogen and helium |
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| more is known about the ___ than any other celestial body |
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| diameter about 1 quarter of the earth; no atmosphere |
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| like a magnetic compass the ___ aligns with earths gravitational field |
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| moons shadow fall son earth |
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| earths shadow falls on moon |
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| samll rocky bodies that orbit the sun; most between mars and jupiter; |
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| are masses of water methane and ice; mostly in Kuiper belt; tails point away from the sun |
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| relatively small pieces of debris from asteroids or comets |
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| a meteoroid that strikes earths surface |
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| a meteriod that survives the trip through the earths surface and reaches earths atmosphere |
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