1. 28.3 Satellites of Other Planets
Std 1F: Know the evidence for the dramatic effects that asteroid impacts have had in shaping the surface of planets.
Objective 1: Compare the characteristics of the two moons of Mars.
Objective 2: Name one distinguishing characteristic of each of the Galilean moons.
Objective 3: Compare the characteristics of the rings of Saturn with the rings of the other outer planets.

2. Moons of Mars Mercury and Venus do not have moons.
Saturn, Jupiter, Uranus, and Neptune all have rings.
Mars has 2 moons (Phobos and Deimos)
Have irregularly shapes
Surfaces are dark and have many craters
Possibly captured asteroids

3. Moons of Jupiter
Galilean moon - any one of the four largest satellites of Jupiter—Io, Europa, Ganymede, and Callisto - discovered by Galileo in 1610
3 are larger than Earth’s moon!

4. Io
The innermost moons
1st extraterrestrial body to have active volcanoes
Eject thousands of metric tons of material each second.

5. Europa 2nd closest Galilean moon to Jupiter
The size of Earth’s moon (less dense.)
Rock core with a crust of ice that is about 100 km thick.
Liquid water may exists under the ice.
If liquid water exists, life forms could exist

6. Ganymede 3rd Galilean moon from Jupiter
The largest moon in the solar system
Small mass (composed of ice mixed with rock)
The surface has dark, crater-filled areas, and light areas that may be ridges and valleys.

7. Callisto The farthest Galilean moon from Jupiter.
Callisto is similar to Ganymede
size, density, and composition
Most densely cratered moons in our solar system.

8. Moons of Saturn Saturn has over 30 moons (5 moons are large)
Saturn’s largest moon is Titan
diameter >5,000 km.
Titan’s thick atmosphere = mainly of nitrogen.

9. Moons of Uranus and Neptune
Uranus’s moons (4 largest moons )
Oberon, Titania, Umbriel, and Ariel
Discovered by mid-1800’s.
Miranda(5th moon) was discovered in 1948
Has over 12 moons.
Neptune (8 moons)
Triton revolves around Neptune in a retrograde orbit.

10. Pluto’s Moon Charon is 1/2 the size of Pluto
Some scientists consider them to be a double-planet system.
Charon orbit around Pluto = 6.4 day
Pluto’s day (rotation) = 6.4 day Pluto.
Day = rotation means Charon stays in the same place in Pluto’s sky.

11. Rings of the Gas Giants Saturn’s rings Jupiter
discovered over 300 years ago
Made of billions of pieces of rock and ice
Jupiter
Thin ring made of microscopic particles given off by Io.
Uranus has a dozen thin rings.
Neptune’s relatively small number of rings are clumpy rather than thin and uniform.