NATS 1880 Study Guide - Final Guide: Giovanni Domenico Cassini, Galilean Moons, Polycyclic Aromatic Hydrocarbon
25 Jun 2017
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*requirements for life: (venusian clouds, jovian moons, mars) & widespread in universe. 1. (likely) organic molecules: from solar nebula -> need water/atmosphere to react. 96% of life = n, o, c, h* Chemical energy: molecules interact through gas or water. 3. (unlikely) water: reactions & transportation (hydrogen bonds) Higher & wider range of temperature: climate changes. Density: hydrogen bonds as it freezes = less dense. Conserves heat & liquid water below ice sheet. Water is a polar molecule: only dissolves other polar molecules (salt) (electrons distributed unevenly)* Cell membrane: don"t dissolve & are protected. Ideal solvent: wide temp range, ice less dense, & polar* Common, stay liquid, & less polar -> cell membranes fall apart. Too small: escaped atmosphere (due to weak gravity)*, volcanism/heat/tectonics, Liquid water: unlikely (possible ice in polar craters)* Crust thickness: 60 km (earth facing) vs. 150 km. Maria: worst impacts, lled with basalt (15-20% surface) Highlands: repeated heavily cratered impacts (80-85% surface)
