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# mars - Announcements Campus Observatory Sep 29 Guest...

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1 Announcements Sep 29: Guest lecture by Mr. Justin Linford Sep 29: Homework #4 is due Sep 30: Campus Observatory @ 8pm Oct 10: Review for Test #2, 3:25pm Oct 11: Test #2 Oct 13: Fall break, no class Campus Observatory Friday @ 8pm you are here Mercury = 5.4 g/cm 3 Mass Radius Density = 3.3 x 10 26 g = 0.055 M Earth = 2439 km = 0.38 R Earth Semimajor axis = 0.39 AU Venus Mass = 0.82 M Earth Radius = 0.95 R Earth Density = 5.2 g/cm 3 Average distance from Sun = 0.72 AU Orbital period = 225 days Rotation period = 243 days (longer than orbital period, and retrograde!) Earth Mass: M Earth = 6 x 10 27 g Radius: R Earth = 6378 km Density: ρ = 5.5 g/cm 3 Age: 4.6 billion years Orbital period = 365 days Rotation period = 1 day Mars Mass = 0.11 M Earth Radius = 0.53 R Earth Density = 3.9 g/cm 3 Average distance from Sun = 1.52 AU eccentricity = 0.093 Range in distance from Sun = 1.38 - 1.66 AU Rotation Period = 24.6 hours Orbital Period = 687 days

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2 Terrestrial Planets' Spin, Habitability Clicker Question: The terrestrial Planet with the lowest average density is: A: Mercury B: Venus C: Earth D: Mars Clicker Question: Large scale motions of the crust (plate tectonics) are seen on which planets: A: Mercury and Venus B: Earth, Venus and Mars C: Only the Earth D: Mars and Venus E: All terrestrial planets - Mercury, Venus, Earth and Mars. Clicker Question: It takes 8 minutes for light to travel 1 AU, how long does it take for a radar signal to travel from Earth to Mercury and back at its closest point to Earth in its orbit?
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