The PLANETS and other stuff

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The PLANETSand other stuff

• Chapter 20 stinkn 7

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Two Groups of Planets

• How are planets classified as inner outer ?
• By the Asteroid belt
• terrestrial planetsINSIDE
• What makes them all alike ???
• Rocky crust--internal structure--dense

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• Outside the asteroid belt
• the JOVIAN PLANETS
• they are gaseous MUCH less dense
• Pluto, cuz of its location not dense enough to
  be terrestrial and not big enough to be Jovian.

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Mercury !!!

• How long to go round ? 90 DAYS
• Rotates VERY slow 60 DAYS
• Diameter 4878 km
• very thin atmosphere 2 reasons ?
• hot during the day 400 0 C
• very cold at night - 200 0 C
• Why is it cratered ?

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VENUS !!!

• Earths twinsame size, mass, density
• Orbit period --- 225 days
• rotation period --- 243 days
• surface temperature 482 0 C
• 96 of atmosphere CO2

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• MERCURY VENUS are known as the EVENING MORNING
  STARS
• ORBITS are Closer to the sun than the Earth so
  they are only seen during those times

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2005

• Venus Mercury can be seen in the evening this
  time of year
• SOUTH WEST IN THE SKY
• AROUND 5 to 7 pm
• VERY CLOSE TO THE HORIZON!!!

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MARS !!!

• Period of orbit 687 days
• Rotation 40 minutes longer than the Earth
• Tilted on axis just like Earth
• this means that Mars has how many seasons ?

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• Mars is geologically active
• Olympus Mons, a volcano, 3x larger than Mt .
  Everest
• Viking 1 2 found evidence of erosion from H2O.
• Temps.
• During the summer 20 0 C
• During the winter -130 0 C

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• Asteroid belt ----gt between Mars Jupiter.
• Extinct cometsor PLANET
• Solid rocklike masses
• odd shapes . . . So!!!
• brightness changes as they rotate

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The Outer Planets

• The smallest jovian planet is 15x BIGGER than
  Earth.
• light elements???
• Jovian planets have a 3 layered structure
• Rock core liquid mantle gaseous atmosphere
• Rings closer than the moons

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Jupiter !!!

• Orbit time 12 years
• Rotation fastest 10 hours
• 2x more mass than all planets
• Banded dark are sinking gas
  ... lighter are rising gas
• Between are winds 400 km / h
• The Great Red Spot !!! 3x bigger than the Earth.

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SATURN !!!

• Time of orbit 30 years
• Time of rotation 11 hours
• Wind speed _at_ equator 1800 km/h
• Most visible rings !!!
• 3 major 1000 total
• Made up of billions of snowballs

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U-RAN-US !!!

• Time of orbit 84 years
• Rotation 17 hours
• light is 360x fainter than on Earth
• Avg. surface temp -200 0 C
• Tipped on its side with the south pole facing the
  Sun

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NEPTUNE !!!

• Period of orbit 165 years
• Period of rotation bout 16 hours
• Wind speed 2200 km / h
• Temps. at - 214 0 C

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PLUTO !!!

• Orbits the Sun every 248 years
• Rotation is uncertain
• Very cold _at_ -220 0 C
• Frozen solid on surface
• Highly elliptical ECCENTRIC

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Comets and junk

• The parts of a comet
• nucleus inside hazy coma hydrogen cloud
• long, bright tails

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Meteors Meteoroids

• Meteoroid -- rock or icy fragment traveling in
  space
• Meteor -- light made by meteoroid as it passes
  through Earths atmosphere
• Meteorite is the one that actually hits us !!!

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