ASTR 380 Study Guide - Midterm Guide: Likey, White Dwarf, Perchlorate
13 Dec 2015
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H20 liquid more dense than ice h20; ice freezes, keeps heat in water below. High heat capacity; water acts like buffer to keep temp. from wild fluctuations (ice floats) Acid -base liquid can break up into positive and negative pieces ; can react with other things. 1. mercury: 3,000 miles , ( 602 f) ( smallest planet) C02 in atmosphere ( 96%) due to greenhouse effect , traps heat & water vapor from past water. No oceans (no way to rid c02 in the atmosphere) Disappearance of water due to uv light from the sun break up molecules (mars) No internal heat/ freeze over (too small) Loss of c02 & h20 (by impacts/ solar wind particles) Thin atmosphere(thick in past b/c outgas by volcanoes) H2 broken from uv light by thermal escape; 02 lost in space. *diff b/t venus & earth: sun 30% closer to venus. Possible , water 4b years ago, when sun was dimmer.
