Science Weblecture for Unit 61
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Close exploration of the solar system became possible in the 1950s with the first successful rocket launches from earth. Sputnik (USSR) and Explorer I (USA) were Earth orbiters, but Luna (USSR) and Pioneer (USA) missions both tried to explore the moon, while other Pioneer missions.
You have to be patient to be an unmanned-spacecraft explorer. Voyager 2, was launched in 1977, took two years to reach Jupiter (1979), and another two to reach Saturn (1981). Although originally scheduled only to get to Saturn, Voyager 2 was still working and responsive to directives, so NASA authorized an extended mission, and Voyager 2 reached Uranus in 1986 and Neptune in 1989. Other spacecraft have had similarly long careers: Pioneer 10 was launched in 1972 and continued to send information back until 2003.
Look at NASA's Solar System Exploration site. There is a lot of material here so concentrate on one planet (Mars) for discussion in class, then pick another planet for your homework assignment.
For each of the other planets and moons, identify the planetary structure, atmosphere contents (if any), magnetosphere, and key surface features (eve gas giants have these!). Identify any other odd features (i.e., Uranus' tilt, Venus' slow rotation).
Planetology is the study of the common characteristics of planets. We can compare atmospheres, surface features (for terrestrial planets), rings, moons, magnetic fields, composition, amount of energy from the sun available, and so on.
Take a look at the University of Washington's Comparative Planetology lab.
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