Four major factors can lead to long term climate change on terrestrial worlds 1. solar brightening 2. changes in axis tilt 3. changes in reflectivity 4. changes in greenhouse gas abundance Three proccesses provide gas to terrestrial atmospheres 1. outgassing 2. evaporation 3. sublimination How atmospheres lose gas 1. thermal escape 2. condensation 3. solar wind 4. chemical reactions 5. large impacts ? seasons on mars last twice as long as those on earth ? the martian sky is a deep blue almost black
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