Presentation on theme: "28.3 Satellites of Other Planets"— Presentation transcript:
128.3 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.
2Moons 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 shapesSurfaces are dark and have many cratersPossibly captured asteroids
3Moons of JupiterGalilean moon - any one of the four largest satellites of Jupiter—Io, Europa, Ganymede, and Callisto - discovered by Galileo in 16103 are larger than Earth’s moon!
4IoThe innermost moons1st extraterrestrial body to have active volcanoesEject thousands of metric tons of material each second.
5Europa 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
6Ganymede 3rd Galilean moon from Jupiter The largest moon in the solar systemSmall mass (composed of ice mixed with rock)The surface has dark, crater-filled areas, and light areas that may be ridges and valleys.
7Callisto The farthest Galilean moon from Jupiter. Callisto is similar to Ganymedesize, density, and compositionMost densely cratered moons in our solar system.
8Moons of Saturn Saturn has over 30 moons (5 moons are large) Saturn’s largest moon is Titandiameter >5,000 km.Titan’s thick atmosphere = mainly of nitrogen.
9Moons of Uranus and Neptune Uranus’s moons (4 largest moons )Oberon, Titania, Umbriel, and ArielDiscovered by mid-1800’s.Miranda(5th moon) was discovered in 1948Has over 12 moons.Neptune (8 moons)Triton revolves around Neptune in a retrograde orbit.
10Pluto’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 dayPluto’s day (rotation) = 6.4 day Pluto.Day = rotation means Charon stays in the same place in Pluto’s sky.
11Rings of the Gas Giants Saturn’s rings Jupiter discovered over 300 years agoMade of billions of pieces of rock and iceJupiterThin 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.