Outline

The Terrestrial Planets	243
8.1Portraits of the Terrestrial Planets	244
8.2Mercury	246
Mercury's Temperature and Atmosphere	247
Mercury's Interior	249
Mercury's Rotation	250
8.3Venus	251
The Venusian Atmosphere	251
The Greenhouse Effect	252
The Surface of Venus	252
The Interior of Venus	256
Rotation of Venus	256
8.4Mars	257
The Martian Atmosphere	260
The Martian Interior	263
The Martian Moons	264
Life on Mars?	264
8.5Why Are the Terrestrial Planets So Different?	265
Role of Mass and Radius	265
Role of Internal Activity	266
Role of Sunlight	266
Role of Water Content	266
Role of Biological Processes	266
8.6Update: Exploring Mars	267

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