3sept03_notes - 3 Sept 2003 Solar System C C Lang 1 Check...

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3 Sept 2003 Solar System - C. C. Lang 1
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3 Sept 2003 Solar System - C. C. Lang 2 Northerners have cold days in January because: (a) the earth is farthest from the Sun in January (b) the orbital velocity of Earth is greatest in Jan. (c) the Sun is lower in the sky in January (d) El Nino is always strongest in January Check your knowledge-- ANSWER: (c)
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3 Sept 2003 Solar System - C. C. Lang 3 Physical Features of Mars The Martian Surface as revealed by the Mariners, Vikings - craters - volcanoes - plains Evidence for Water on Mars - geological - chemical The Martian Atmosphere
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3 Sept 2003 Solar System - C. C. Lang 4 Fast Facts on Mars: size = 5974 km/4200 miles ~53% Earth’s size mass = 6.5 x 10 23 kg or 0.1 Earth’s mass density = 3900 kg/m 3 (Earth’s density = 5510 kg/m 3 ) gravity/physics will be different on Mars, i.e., mts., activity in planet’s core
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3 Sept 2003 Solar System - C. C. Lang 5 Changes in surface coloring: thought once to be vegetation!!
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3 Sept 2003 Solar System - C. C. Lang 6 Fly by of Mars on 31 Jul 1969 - came within 2,130 miles of Mars - pictures of ~20% surface (missed important volcanic features) - sent back ~80 photos (Mar. 6) and ~120 photos (Mar. 7) Mariners 6 and 7 had scientfic instruments to study Martian atmosphere: - composition, pressure, density, and temperature - two cameras - infrared spectrometer - ultraviolet spectrometer Mariners 6 and 7
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3 Sept 2003 Solar System - C. C. Lang 7 Martian surface covered with craters! - surface isn’t smooth (as historical observations thought) - similar to Moon surface (being studied simultaneously) - must be old: peak in impacts ~3.8 billion years ago - difficult to see from Earth, but Mars’ thin atmosphere - many gave up hope for seeing “water”/ “life” on Mars
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3 Sept 2003 Solar System - C. C. Lang 8 Mariner 9 – first ORBITER spacecraft!!
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3 Sept 2003 Solar System - C. C. Lang 9 Mariner 9 was the first spacecraft to orbit another planet
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3sept03_notes - 3 Sept 2003 Solar System C C Lang 1 Check...

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