NATS 1880 Chapter Notes - Chapter 7: Chemical Polarity, Ethane, Geology Of The Moon
11 Apr 2016
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7: searching for life in our solar system. Life on earth uses 25 out of 92 elements of periodic table. H, o, n, c make up 96% of living organisms. Need more than just elements for life; need amino acids. Inverse square law: at 3 au, the sun is only 1 / (3x3) = 1/9 as bright as 1 au. Other liquid can subsitute water but it must be abundant and remain liquid over a reasonable temp and range. A bigger range means higher chance of the liquid staying liquid. Water is a polar molecule; it assists in having materials dissolve in it. Habitable world must have liquid, above or below surface. This will result in raw materials and energy. Mass 1/81 of earth and lower avg density and gravity 1/6 of earth. Mantle is warm and somewhat plasic (can move) Earth-side crust is 60km thick and far-side crust is 150km. Barely a magneic ield due to small core.
