42 AU (~50K) -over 1000 objects identified Comets -where astronomers believe 1200 km across short period comets originate from Oort 30 km from ~4 Kelvin Spherical Shell of None Long period N/A -Farthest from sun and still Cloud sun (almost icy bodies comets- up to 30 be in SS absolute 0) (comets) million years to -Most long period comets 50,000-100,000 complete 1 orbit believed to originate from AU from sun -452 °F Oort Cloud (-269 °C) -Total mass 40Xs earth Billions of icy bodies -Hypothetical ring of debris and comets left from formation of SS Moon Distance from planet Temp Composition Rotation and Atmosphere Special Features and size and color Orbital Time Interesting Facts Moon Distance from White to gray; Synchronous orbit Very thin due -2nd brightest object in sky Earth=239,000 mi -387 to 253 °F depends on to gravity -Only other object in Universe (384,000 km) titanium and iron 27.3 days visited by man; Neil Armstrong -233 to 123 °C content He, Ar, H was the first human on moon, July D= 2160 (3500 20, 1969 km) 45% SiO2, -Moon’s gravitational pull causes 20% Al2O3, tides *distance from Earth 14% CaO, 10% increases ~1.5 inches FeO, 8% MgO, per year 3% TiO2 Ganymede Distance from -333 to -186 °F Brownish Synchronous Very thin Only moon in System to Jupiter= 665,000 mi have a magnetosphere Silicate rock and (1,070,000 km) -203 to -121 °C 7.15 days Traces of O2 water/ice Galileo discovered 1610 Frosts cause Largest moon in Solar System bright spots D=3270 mi (5300 km) Layered interior Moon Distance from planet Temp range Composition Rotation and Atmosphere Special Features and size and color Orbital Time Interesting Europa -370 to -235 °F Marble white with Synchronous Very thin Frozen Distance from red-brown streaks Jupiter= 417,000 mi -220 to -148 °C 3.55 days Traces of O2
42 AU 1200 km across (~50K) Comets -over 1000 objects identified -where astronomers believe short period comets originate from Oort Cloud 30 km from sun 50,000-100,000 AU from sun Billions of icy bodies ~4 Kelvin (almost absolute 0) -452 °F (-269 °C) Spherical Shell of icy bodies (comets) None Long period comets- up to 30 million years to complete 1 orbit N/A -Farthest from sun and still be in SS -Most long period comets believed to originate from Oort Cloud -Total mass 40Xs earth -Hypothetical ring of debris and comets left from formation of SS Moon Distance from planet and size Temp Composition and color Rotation and Orbital Time Atmosphere Special Features Interesting Facts Moon Distance from Earth=239,000 mi (384,000 km) D= 2160 (3500 km) *distance from Earth increases ~1.5 inches per year -387 to 253 °F -233 to 123 °C White to gray; depends on titanium and iron content 45% SiO2, 20% Al2O3, 14% CaO, 10% FeO, 8% MgO, 3% TiO2 Synchronous orbit 27.3 days Very thin due to gravity He, Ar, H -2nd brightest object in sky -Only other object in Universe visited by man; Neil Armstrong was the first human on moon, July 20, 1969 -Moon’s gravitational pull causes tides Ganymede Distance from Jupiter= 665,000 mi (1,070,000 km) D=3270 mi (5300 km) -333 to -186 °F -203 to -121 °C Brownish Silicate rock and water/ice Frosts cause bright spots Layered interior Synchronous 7.15 days Very thin Traces of O2 Only moon in System to have a magnetosphere Galileo discovered 1610 Largest moon in Solar System Moon Distance from planet and size Temp range Composition and color Rotation and Orbital Time Atmosphere Special Features Interesting Europa Distance from Jupiter= 417,000 mi -370 to -235 °F -220 to -148 °C Marble white with red-brown streaks Synchronous 3.55 days Very thin Traces of O2 Frozen