Lecture 18

Question 1

Galilean Satellites

Answer 1

Io Europa Ganymede Callisto (ordered by distance)

Question 2

What is the most volcanically active body in the solar system?

Answer 2

Io

Question 3

Evidence of Active Volcanism on Io

Answer 3

Umbrella Shaped Eruption Plumes - 300 Km High and 1000 Km wide
Fissure Eruptions

Question 4

Implications of IO’s volcanism

Answer 4

100x more lava than Earth
Resurfacing Rate of 1m/1000 years
Surface Age < 1 Ma

Question 5

IO Geologic History

Answer 5

Originally Volatile-Rich
Fe-S core, silicate mantle
Heat Produced due to Tidal Heating

Question 6

Europa Features

Answer 6

Few Craters
Low Relief
Ice Rafts

Question 7

Europa Geologic History

Answer 7

Volatile Rich Materials
Differentiation
Fe Core
Silicate Mantle
Lithosphere is 100km thick ice or ice capped ocean

Question 8

Europa Tidal Effects

Answer 8

Heating
Liquid water ocean
Fracturing, Resurfacing

Question 9

Ganymede Features

Answer 9

Dark Cratered Terrain
Light Grooved Terrain

Question 10

Ganymede Geologic History

Answer 10

Volatile Rich Materials
4.5 Ga Differentiation
Fe-S Core
Silicate Mantle

Question 11

When did the Cratered Terrain form on Ganymede?

Answer 11

4.5 - 4.0 Ga

Question 12

When did the grooved Terrain form on Ganymede?

Answer 12

3.5 Ga

Question 13

Callisto Features

Answer 13

Dominated by Impact Structures
Impacts onto an icy surface
- Multiring structures
- Bright central areas

Question 14

Callisto Geologic History

Answer 14

Volatile rich material
Undifferentiated
Surface > 4.0 Ga
No Apparent Tidal Effects

Question 15

Galilean Satellites differences with distance from Jupiter

Answer 15

Increasing in Surface Ages
Decrease in Density

Question 16

Why are the Galilean Satellites so different if they have the same original materials?

Answer 16

Different distances from Jupiter leads to different levels of Tidal heating, magnetic field effects, and gravitational pull effects