Orbital Properties Bulk Properties Internal Structure Atmosphere Surface Features. Chapter 9: Venus Earth’s Sister Planet. Objectives. After completing this chapter, you should be able to: compare the general physical properties of Venus to Earth and the Moon.
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(counter-clockwise as viewed from N-pole of Solar System)
Dark areas: smooth
Light areas: rough
Center view of N-pole;
outside four views of equator
water vapor, carbon monoxide, sulfur dioxide, argon
The sulfuric acid clouds are separated into three distinct layers. These layers occur at altitudes where the combination of temperature and pressure causes sulfuric acid to condense.
Works on Venus as it does on Earth, but Venus has ~1 million x more CO2 , so effect is much stronger.
Color photos of surface rocks. These photographs were obtained by the Soviet Venera 13 and 14 landers. The yellowish color seen here is an artifact of the camera response; reprocessing of these images has shown that the surface rocks are gray, like similar rocks on Earth. (TASS from SOVFOTO)
This is a Magellan reconstruction of a region in Eistla Regio. At the left is the volcano Gula Mons; at the right is Sif Mons. Lava flows extend from Gula Mons toward lower right. (NASA/JPL)
Most common volcanic feature on Venus; similar to Earth’s Hawaiian Islands; characterized by formation of a caldera
A large volcanic caldera. This is a depression called Sacajawea, in the Lakshmi Plenum region of Venus. The enormous caldera is 1 to 2 km deep, 120 km wide, and 215 km long. It is thought to have formed as the result of drainage and collapse of a large underground magma chamber. (NASA/JPL)
The large, circular feature seen here is a corona. It is a raised structure, approximately 200 km in diameter, thought to be the result of uplift due to upwelling magma from below. The smaller circular feature is a "pancake" dome, about 35 km in diameter, formed by the eruption of very viscous lava. Another pancake is seen to the left; these features are seen only on Venus. (NASA/JPL)
Rim = 30 km diameter
62 km diameter domes from by extrusion of high viscosity lava at surface
23x vertical exaggeration 2.4 km diameter 750 m high false color from Venera mission information
This is the highland region Ovda Regio, near the equator of Venus. The complex structure seen here is thought to be the result of compression (in the upper left-lower right direction) followed by stretching (upper right to lower left), caused by flowing motions in the mantle of Venus that are similar to the motions that cause continental drift on the Earth. (NASA/JPL)
Tesserae. This complex pattern of intersecting ridges and cracks is thought to be the result of repeated episodes of horizontal motion. (NASA/JPL)