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Ast1141Lec22Requirementsforlife.pptx - The Requirements for...

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The Requirements for LifeAstronomy 1141
A Source of EnergyEnergy to fuel chemical reactionsWarmth to permit liquid water (other liquids?)Complex ChemistryElements heavier than H and HeCarbonas the building block of complex moleculesProtection from harmful UV lightMutations from UV radiation inhibit the emergence of lifeShield with an ozone layer, water oceans, or undergroundA Liquid Solvent MediumPlace for complex chemistry to occurThe Basic Requirements for Life
All Earth life uses DNA & RNA to store geneticinformation, and ATP to transport energy within cells.Other molecules could do the same jobs:DNA, RNA, & ATP are not absolutelyrequiredfor life in theuniverse.udaix (shutterstock)ATPWikimedia commons
The Sun’s brightnessdepends your distancefrom it.B = Brightness of SunlightL = Sun’s LuminosityD = Distance from SunInverse-Square Law of BrightnessThe Sun is the main energy source in the solar system.How much energy depends on yourdistance.24LBD
D=distancein AUAb=AlbedoAlbedomeasures how efficientlya body reflects light.Moredistantobjects arecooler.Hannes Grobe (wikipedia)The amount of solar heating you receive depends onyourdistancefrom the Sun and howshinyyou are.

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Term
Fall
Professor
Tendrup
Tags
Planet

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