Chapter 7. Earth and The Terrestrial Worlds. Principles of Comparative Planetology. Comparative Planetology is the study of the solar system through examining and understanding the similarities and differences among the planets. Planetary Geology:
Earth and The Terrestrial Worlds
Venus’ surface- atmosphere is not shown. Surface mapped from Megellan spacecraft radar data
Mars Exploration Rover Mission: The Mission
Apollo Lunar Missions (1969-1972)
Mars Pathfinder Mission (1996-1997)
There are four main geological processes
c) “Sticky” lava makes steep-sloped stratovolcanoes.
Picture by US Geological Survey scientist, Austin Post, on May 18, 1980.
Atmospheric gases scatter blue light more than they scatter red light.
Longer wavelength red light is more penetrating
Five Major Processes By Which Atmospheres Lose Gas.
Astronaut explores a small crater
An ancient lava river
Polar Ice Cap (Mars) Viking Orbiter
Edge of polar ice cap showing layers of ice and dust.
Mars (3,397-km radius, 1.52 AU from the Sun)
Heavy cratering in Southern Hemisphere
Olympus Mons: – largest shield volcano in the solar system
Ancient River beds
Outflow channels indicate catastrophic flooding
Water eroded crater
Gullies on a crater wall formed by water flows?
Shield Volcanoes are common
Impact craters on Venus are rare
Fractured and twisted crust