Amazing Saturn. Saturn from the ground
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1 1 Amazing Saturn Saturn from the ground
2 2 Saturn Information Overload The Cassini Mission started orbiting Saturn in 2004.
3 3 Getting There Planetary pinball with passes by Venus, Venus, Earth, and Jupiter to pick up speed.
4 4 Saturn Information Overload The orbiter includes imaging, radar, particle and field experiments and a probe that was dropped onto Saturn's largest moon, Titan.
5 5 Saturn Information Overload Orbit after orbit its has provided a firehose of information about Saturn, its rings, and its Moons.
6 6
7 7
8 8
9 9 Infrared image showing that Saturn, like Jupiter radiates internal energy in excess of the Sun's input. It should have cooled off by now however. It is likely that differentiation of helium toward the center of Saturn is generating mechanical energy.
10 10
11 11
12 12
13 13
14 Saturn's Rings Saturn's rings consist of a myriad of particles of relatively pure water ice with sizes ranging from from snowflakes to mountains (and moons). All combined the material amounts to no more than a tiny moon's worth of ice. The rings likely originated via the disruption (via impact?) of a small icy satellite. 14
15 15 The Roche Limit and Planetary Rings
16 16 Substructure in Saturn's Rings Mimas Consistent tugs from satellites clear out gaps. Mimas maintains the Cassini Division (the most apparent large gap). A particle in the Cassini Division orbits Saturn twice for every one orbit of Mimas.
17 17 Mimas
18 18 Satellites can directly create gaps and shape rings as well.
19 19
20 20
21 Tenuous outer rings formed by erosion and, in the case of Enceladus, cryovolcanic activity. 21
22 22 Erosion of Phoebe by impacts generates (temporary) ring particles that strike and modify Iapetus.
23 These particles are evident via their mid-infrared blackbody glow, despite being only 90K (-300F) 23
24 24
25 25
26 26 Big Icy Satellites Dione Rhea
27 27 Big Icy Satellites Tethys
28 28 Equatorial Ridge Voyager Mountains Iapetus
29 29
30 30
31 31
32 32 Hyperion Dozens of Small Icy Satellites Janus Epimetheus Telesto
33 33 Hyperion
34 34 Phoebe Orbits Saturn backwards Source of its own diffuse ring Is it a captured comet /Kuiper Belt Object?
35 35 Enceladus An inner moon of Saturn. The most reflective object in the solar system. Brighter than snow! Both young and old terrain
36 36 Enceladus!
37 37
38 38
39 39 The Plumes of Enceladus Water vapor and ice particles launched at speeds high enough to escape. Liquid water inside Enceladus?? Tidal heating (a little) Radioactive heating (maybe) Water-ammonia mixture (possible)
40 40 A World Too Small for Volcanism?
41 41 Enceladus to Scale Enceladus
42 42 The south pole cracks, which are the source of the jets, are warmer than their surroundings. The boxes give temperature in Kelvins so about -300F.
43 43 Warm Eruption Sites
44 44 A Potential (unexpected) Habitat
45 45 Titan Titan is the second largest moon in the Solar System and bigger than the planet Mercury.
46 46 A Chemistry Laboratory Titan has a thick, primarily nitrogen, atmosphere with a surface pressure 1.5 times that of Earth. The atmosphere contains traces of methane and ethane as well as other organic molecules. Ultraviolet sunlight breaks these molecules apart and they reassemble into even more complex molecules. Larger The atmosphere is filled with organic particle smog that hides the surface at visible wavelengths molecules and particles filter down and collect on the moon's surface.
47 47 A Thick Smoggy Nitrogen Atmosphere
48 48 Peering through the Smog at Titan Small particles block short wavelength light but permit longer wavelengths to pass. Sunsets are red for this reason. Red light penetrates the atmosphere better than blue. Visible Infrared
49 49 A relatively crater free surface resurfaced by weather and cryovolcanism.
50 50
51 51 Clouds and (methane) Rain on Titan
52 52 Springtime Weather on Titan
53 53 Lakes and Erosion on Titan
54 54 Lakes and Erosion on Titan
55 55 Lakes and Erosion on Titan
56 56 Lakes and Erosion on Titan
57 57
58 58 Visiting Titan's Surface The Huygens Probe
59 59 Visiting Titan's Surface The Huygens Probe
60 60 Visiting Titan's Surface The Huygens Probe
61 61 Visiting Titan's Surface The Huygens Probe
62 62 Visiting Titan's Surface The Huygens Probe
63 63
64 64
65 65 The Surface of Titan
66 66 Atmospheric Composition
67 67 Things to Know About Saturn Saturn has the same types of clouds as on Jupiter but lower in the atmosphere (thus harder to see). Saturn's rings are made of nearly pure water ice chunks kept apart by Saturn's gravity (Roche Limit) gaps cleared by tugs from Moons Titan is the 2nd largest moon in the Solar System It has a thick nitrogen atmosphere Methane/ethane are trace gasses that forms clouds and produce rain. The surface is eroded by the weather Solar ultraviolet radiation forms an organic smog, coating the surface with pre-biotic chemical compounds. Enceladus, a tiny moon, has water geysers that spray material out to form Saturn's E-ring. Subsurface water means prospects for life!
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