Earth Sciences 1086F/G Chapter Notes - Chapter 10-11: Escape Velocity, Axial Tilt, Tidal Locking
16 Apr 2015
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Only seen for 3 hours after sunset and before sunrise. Brightest object in the sky other than moon. 96% co2 with n2, water vapour, so2, free oxygen. Not stable, large volumes are escaping into space. Runaway greenhouse effect (rising temperatures caused water to evaporate; surface got so hot that the carbon in rocks sublimated and combined with oxygen to form more co2) Lies in almost same plane as earth. 1 venusian day = 117 earth days. Sharp geological features such as mountain ridges and cliffs created by wind. Crust is hot, therefore not stiff, therefore cannot form plates. Weak magnetic field, created by interaction between solar wind and atmosphere. Magellan: orbited for 4 years, then entered atmosphere; recorded surface features. Venus express: observed atmosphere, detected magnetic field. Similar obliquity to earth, therefore have similar seasons. 1 mars day is almost equal to one earth day. Northern lowlands: smooth, resurfaced by volcanic floods.
