If your plan is for one year, plant rice. If your plan is for 100 years, educate children. Confucius
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- Griselda Hoover
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1 If your plan is for one year, plant rice. If your plan is for 100 years, educate children. Confucius Test 1 on Wednesday Feb. 20. Sample test and review are On the course web page now. Grades are there too. In class assignment on Friday. Seating chart posted soon.
2 Density = 5.2 g/cc No moons
3 Mars
4
5 Mars structure: 1) Crust2) Mantle3) Core- Mars' atmosphere is 95% CO2 (like Venus, but much less dense) Density is 3.9 g/cc. (Earth=5.5 Moon=3.3)
6 Wind erosion.
7 Water erosion
8 Two rovers, Spirit and Opportunity landed in Spirit stopped working in 2010, Opportunity stopped last June!!
9 New, dusty, cleaner.
10 Moons of Mars: Phobos and Deimos
11 The Curiosity rover watches the 2 moons pass each other.
12 How did these 2 moons form? They are both small (11 and 27 km across), both not round!!! (so not massive) orbit over Mars' equator (not in the ecliptic) both orbits are nearly circular Deimos' orbit is nearly geosynchronous. Phobos' orbit is decaying and eventually Phobos will fall onto Mars...in about million years.
13 How did these 2 moons form? Two theories: 1) they are captured asteroids. 2) Another body (stray asteroid?) passed too close to Mars and broke into bits. Over time, all the other bits (and Phobos in a few million years) have fallen onto Mars.
14
15 Terrestrial planets.
16 Terrestrial Planet Atmospheres Mercury- very thin, tenuous atmosphere Venus- thick 95% CO2 atmosphere Earth- N, O, CO, CO2 atmosphere Mars- thin 95% CO2 atmosphere
17 Terrestrial Atmospheres The original atmospheres of terrestrial planets probably all started as H, which was quickly lost to space.
18 Terrestrial Atmospheres The second atmospheres of terrestrial planets probably all started the same- mostly CO2, H2O, SO2, NH3. Assumes the source of the atmosphere is volcanic.
19 Terrestrial Atmospheres The second atmospheres of terrestrial planets probably all started the same- mostly CO 2, H2O, SO2, NH3. So what happened? Based on mass (escape velocity) of the body, mass and temperature of the gas.
20 Terrestrial Atmospheres Mercury: not enough mass & hot. Atmosphere escapes Venus: Too hot: water escaped over time or reacted with NH3; CO2 remains. Earth: non-equilibrium atmosphere. Life artificially keeps oxygen. Oceans remove carbon. Mars: Right ingredients. But devolved?
21 The Terrestrial Planets: Magnetic fields Earth: caused by liquid iron core dynamo. Mercury: caused by dynamo (liquid core is most likely). 100x weaker than Earth's. Venus: No global field (rotation too slow or no solid core?) Mars: Only a 'frozen in' field, no global dynamo (no liquid core?). Mars once had a field similar to Earth's but it stopped long ago. The Moon: Also has a 'frozen in' remnant field from an earlier dynamo.
22 Common properties of Terrestrial planets.
23 The Terrestrial Planets 1) The 4 planets closest to the Sun. 2) They are all solid objects made of rock. 3) They all have thin atmospheres. 4) They have few moons.
24 As we go further away from the Sun, the solar system gets colder and colder.
25 Jupiter Jupiter.
26 Jupiter's Structure Top: clouds eventually thicken to liquids Middle (and mostly): liquid metallic hydrogen (10 million times the pressure of this room!), generates a strong magnetic field. Core Rocky, metallic core Earth masses. Probably 20,000 Kelvin (40,000oF)! Density of 1.3 g/cc
27 Jupiter s Structure: H clouds thickening to Liquid H, thickening to Liquid metalic H over a Rocky core.
28 Jupiter's moons Jupiter has at least 63 moons. The 4 largest are known as the Galilean moons,
29 (Warm interior) Icy moon structure Crust made mostly of water-ice. Underneath lies a vast liquid layer of water Rocky mantle. Densities ~ 2 g/cc Rocky (iron) core. Density = 3.0 depending on how much g/cc rock to water/ice.
30 (Cold interior) Icy moon structure Rock/ice mixture surface/mantle Rocky (iron-mix) core. Densities ~ 2 g/cc depending on how much rock to water/ice. Density = 3.0 g/cc
31 Densities (in g/cc): Rocky worlds: (Terrestrial planets ~5) Gas Giants: Icy moons: ~2 3
32 Jupiter has rings! Faint, with tiny, dark particles.
33 Jupiter's Rings The shape of the rings is determined by small (shepherd) moons, Jupiter's strong magnetic field, and of course Jupiter's gravity. The particles are extremely smallmicrometer sized!
34 NOT PERMANENT Individual particles last ~1,000 years before falling into Jupiter. Continually replenished by impacts on Jupiter's moons.
35 Jupiter's moons Io is slightly larger than our Moon while Callisto is about the same size as Mercury. Ganymede is 10% larger than Mercury! Locked in synchronous rotation. Only one side faces Jupiter.
36 Jupiter's moons The orbital resonance ratios are 8:4:2 for Io, Europa, and Ganymede (and nearly 1 for Callisto).
37 Io, the innermost Galilean moon
38
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40 Io, the innermost Galilean moon *Io is the most volcanically active body in the solar system! * There are no noticeable impact craters on Io. *The heating is generated by tidal forces (gravity).
41 Io is covered with active volcanoes!
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Object Type Moons Rings Planet Terrestrial none none. Max Distance from Sun. Min Distance from Sun. Avg. Distance from Sun 57,910,000 km 0.
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