lecture_tan14 - Key Concepts: Lecture 14 Venus: structure,...

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Key Concepts: Lecture 14 Venus: structure, surface, magnetic field atmosphere (runaway greenhouse) Use of radar: transparency of atmospheres in radio; Doppler effect Comparison of Terrestrial Planets Venus - Overview • Second planet from Sun • Earth’s sister planet – similar sizes, masses, densities, compositions Property Venus Earth Radius 6052 km 6378 km Mass 4.7 x 10 24 Kg 6.0 x 10 24 kg Density 5240 kg/m 3 5520kg/m 3 Escape Speed 10.4 km/sec 11.2 km/sec Atmosphere Carbon dioxide, Nitrogen Nitrogen, Oxygen Exploration of Venus • Telescopic observation of Venus – Only see cloud layers – reflect 76% of incoming sunlight • Visited by ~ 20 spacecraft – Mariner 2 - first to visit in 1962 – Venera 7 - Soviet Space Craft - first to land on another planet – Venera 9 - first photographs of surface – Magellan - detailed maps of surface from radar • Orbit of Venus around Sun – most circular orbit of all planets – 225 Earth days for 1 complete orbit • Rotation of Venus – Retrograde - in opposite direction of
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lecture_tan14 - Key Concepts: Lecture 14 Venus: structure,...

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