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  • Outer Planets (Jovian Planets)

     -planets beyond the asteroid belt

     - also known as the gas giants

     - all 4 have a ring system made of dust and icy debris

  • Jupiter - -5th from the sun, Largest

    planet

     Its mass is more than 300 Earth’s

     Revolution = 11.86 years (˜12 years)

     Fastest rotation = 9 hrs. 50 min.

  •  Atmosphere – very thick mostly hydrogen(92%), helium, ammonia, methane, and traces of water vapor.

     (if Jupiter was a little bigger it may have became a star)

     Temperature of outer surface is - 160°C

  • Because of different chemical make up

    and motions of Jupiter – various color

    bands and storms are observed (lighting

    also) Example: Great Red Spot – High

    pressure storm = 3 Earths’ in size

    (observed for 400 years)

  •  Has several thin rings (sulfur and dust)

     69 plus moons (4 largest called Galilean moons)

    Io – active volcano’s

    Europa – thick icy crust (may have liquid water)

    Ganymede – also icy crust largest moon

    Callisto – heavily cratered

     Gravity 2.5 times more than Earth

  • Saturn – 6th planet from the sun

     -ringed planet (2nd largest)

     Revolution = 29.5 years

     Rotation = 10 hrs. 39 min.

     Very cold -176°C

  •  Atmosphere – hydrogen, helium, ammonia, etc.

     (many color bands in atmosphere)

     Lowest average density (could float on water)

  •  Rings – very complex – made of several broad rings, each composed of hundreds of ringlets. Made of countless dust, rock, and ice particles.

  •  61 + moons – Largest is Titan (1/2 size of Earth) its atmosphere of nitrogen, argon & methane

     Space probe : Cassini, July, 2004 took best pictures of Saturn and landed a smaller probe on Titan.

  • Other Space probes sent to Jupiter/Saturn:

     Pioneer I & II 1973-75

     Voyager I & II 1979-82 (Voyager I farthest spacecraft)

     Galileo 1995 – Jupiter & its moons

  • Uranus – 7th from the sun

     god of harvest discovered by William Herschel (1781)

     Revolution = 84 years

     Rotation = 17 hrs (retrograde)

  •  has the most tilted axis 87° (tilted on

    its side)

     atmosphere – hydrogen, helium, some methane (gives it a blue-green color)

     temperature average = -214°C

  •  12 thin rings largest is Triton

     27 moons

  • Neptune – 8th planet from the sun

     -god of the sea, discovered in 1846 mathematically

     Revolution = 165 years

     Rotation = 16 hrs.

  •  Atmosphere – hydrogen, helium, methane (make it bluish – twin of Uranus)

     Temperature = -225°C

     Space probes have found great dark spot and white spots showing active storms

  •  6 thin rings, which are thicker in some areas

     14 moons largest called Triton

  • Dwarf Planets: 8 + are know

     Trans- Neptunian objects -

    Kuiper Belt objects

    - mostly ice chunks debris

    Pluto – 9th object from the sun

  •  - god of the underworld/dead

     - discovered in 1930

     - revolution = 248.5 years

     - temperature = -235°C

     - 5 moons largest called Charon

  •  New Horizon space took 9 years to reach Pluto – 1st space probe to gather info on (July 2015)

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