ASTR 101 Lecture Notes - Lecture 30: Axial Tilt
26 Dec 2017
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Document Summary
Mars has mostly solid water (the planet is very cold). There used to be flowing liquid water on the surface. Earth and mars" eccentricity line up (or are very close). canals - led to media belief that there was life on mars. Thought there were continents - need repetitions in science to prove this. First possible scientific evidence of water on mars. Large presence of iron in the rock (rust colour) This structure much more likely to be caused by erosion (creates stepped pattern as water level decreases). Technology lasted over 10 years (expected to only last 90 days). How long is it between instances of closest approach for earth/mars? (perihelion/aphelion alignment). Venus orbits at 0. 7 au, mars at twice that distance. Earth"s axial tilt responsible for our seasons - same for mars. On mars (much larger ecc) so combined seasonality effect (extreme seasonality). Poles have huge seasonal variation in their polar ice caps (like on earth).
