AST 115 1st Edition Lecture 12 Outline of Last Lecture I. Reflecting Telescopes ContinuedII. Astronomical Detection EquipmentIII. Radio AstronomyIV. Other AstronomiesV. Why stars have colorsa. Luminous objectsb. Non-luminous objectsVI. Radiation Lawsa. Blackbody radiationb. Planck/Radiation Curvec. Stefan-Boltzmann Lawd. Wien’s LawVII. Kirchhoff’s Laws of SpectroscopyVIII. Bohr’s Model of the Hydrogen AtomOutline of Current Lecture I. Properties of the Planets of the Solar Systema. Diameterb. Massc. Average DensityII. The Terrestrial PlanetsIII. The Jovian PlanetsIV. Terrestrial vs Jovian Planetsa. Average Densityb. Moons/Satellitesc. Ringsd. Atmospheree. Rotation rateCurrent LectureThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Properties of the Planets of the Solar SystemPlanet Diameter (Earth = 1.0) Mass (Earth = 1.0) Average Density (gm/cm3)Mercury 0.4 0.06 5.4Venus 1 0.8 5.2Earth 1.0 1.0 5.5Mars 0.5 0.1 3.9Jupiter 11 318 1.3Saturn 9.5 95 0.7Uranus 4 15 1.3Neptune 3.9 17 1.6( Pluto 0.2 0.0025 2 )Average Density=Mass of an ObjectVolume of anObjectAlternate units of density:Kg/m3= 1,000 gm/cm3e.g. for Earth: 5,500 kg/m3 = 5.5 gm/cm3 The Terrestrial Planetso The Terrestrials are the 4 inner planets:- Mercury- Venus- Earth- Marso Made of rocky, more dense materialo Venus and Earth are considered “twins”, but are not completely identical The Jovian Planetso The Jovians are the 4 outer planets:- Jupiter- Saturn- Uranus- Neptuneo Pluto used to be part of the Jovians, but it has been re-classified as a Dwarf Planet because of its size and mass.o Uranus and Neptune are considered “twins”, but are not completely identicalo Jupiter is the “King of the Planets”- Has 4 huge satellites Ganymede Callisto Io Plutoo The Jovian planets are made up of gaseous materialso Saturn’s average density is 0.7 gm/cm3, which is lower than the density of water. If you were to place Saturn in a huge bathtub, it would float on top of the water.o The Jovian planets have higher diameters, higher masses, and lower average densities. Terrestrial vs Jovian Planets__Terrestrial Jovian__Average Density: High LowMoons/Satellites: Few ManyRings: none All four have ringsAtmosphere: “Thin” “Thick”Rotation rate: “Slow”
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