06cch6TerrestrialPlanets1

06cch6TerrestrialPlanets1 - Terrestrial Planets Topics...

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Terrestrial Planets: Topics Comparison of Interiors critical role of mass in determining cooling rate Mercury Venus Mars Atmospheres: compare Venus – Earth - Mars You should know the main features/characteristics of each planet. Three types: gaseous (next class). terrestrial rocky (this class) icy/rock small outer objects: Pluto, outer moons, comets.
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Where are planets May 2008? Time Constellation Visibility Mercury evening South of Pleiades week of May 1st Good – for Mercury Venus Near sun No – near sun Mars evening Left of Castor and Pollux Easy Jupiter morning Rises 1 am excellent Saturn evening Orion, 2 deg from fainter Regulus excellent Uranus morning SE Just before dawn poor Neptune evening Too near sun poor Pluto morning Sagittarius Good – for Pluto http://www.space.com/spacewatch/sky_calendar.html
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Mercury 2008 May 01
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Sky 2008 April
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Terrestrial Planets in the Inner Solar System The Earth is one of 8 planets in our solar system . Solar system also includes: satellites, comets, asteroids, meteoroids, gas and dust. Terrestrial planets are the 4 in the inner solar system, on left.
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Terrestrial Planets: Small, Rocky Terrestrial planets: small, rocky, near sun, warm or hot Pluto: smaller, ice & rock, not terrestrial You must know all 9 names and appearances!
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Mass is the key parameter Distance from sun sets major constituents and mass. Terrestrial planets all near the sun Low masses. High densities from rock and iron see: http://nssdc.gsfc.nasa.gov/planetary/factsheet/ Planet Radius (Earth=1) Mass (Earth=1) Density (g/cm 3 ) Moon 0.27 0.012 (1/81) 3.35 Mercury 0.38 0.06 5.43 Venus 0.95 0.81 5.24 Earth 1 1 5.51 Mars 0.53 0.10 3.94
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Lower Mass: Cool Faster Low mass means: - small size - large surface area/volume - loose heat quickly - cold and inactive today Q 06c: Which planet is not. .
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Interiors of Terrestrial Planets
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Mercury Moon like: Rocky Heavily cratered Old Surface Inactive Almost zero atmosphere Q: If two planets. . same radius. . MEAN RADIUS: 2439.7 km MASS: 0.055 (Earth=1) BULK DENSITY: 5.43 (g/cm 3 ) one of largest for a planet SURFACE GRAVITY: 0.376 (Earth=1) ECCENTRICITY OF ORBIT: 0.206 a lot ORBITAL PERIOD: 87.97 Earth days SEMIMAJOR AXIS OF ORBIT: 0.387 AU SPIN PERIOD: 58.65 Earth days
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Mercury is seen at Dawn or Sunset Q: Which planet is this. .
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Mercury is hard to see
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The Resonant Spin of Mercury Tides lengthened the day,
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06cch6TerrestrialPlanets1 - Terrestrial Planets Topics...

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