NATS 1880 Lecture Notes - Lecture 16: Solar Wind, Runaway Greenhouse Effect, Precautionary Principle
27 Aug 2015
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Document Summary
Volume within which a planet (sim to earth) could have surface temp that permit liquid water on its surface. Observations of extrasolar planets will only permit an assessment of surface life at best; not subsurface life if any. Hz can evolve with time (e. g. , mars) Temperature of a planet depends on its: distance from its host star, albedo (proportion of radiation it reflects, atmosphere (greenhouse effect) d, tilt of rotation axis and rotation rate. Planetary surface temperatures depend also on tidal and radioactive heating, tilt of rotation axis and rotation rate. Life can exist outside the habitable zone eg planet with internal. Maybe possible to substitute another liquid medium apart from water with much lower freezing point heating. Earth and possibly earth are in the hz. It is closer to the sun but sunlight is only 1. 9 times more intense than earth; with same atmosphere as earth, it would be only 30c degrees warmer not 180c.
