ENVS 1000 Lecture Notes - Lecture 2: Extremophile, Gaia Hypothesis, Hadean

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Focus: 1) earth: scales, life, gaia, volcano, scales. 4 billion years ago earth is in hadean state (extremely hot) 2 1. 5 billion years ago prokaryotic cells appear eu= good+karyos= kernel. Eukaryotic cells are formed by several prokaryotic cells. These cells are (cid:374)ow fossils; they are also (cid:858)a(cid:374)i(cid:373)al (cid:272)ells(cid:859). 600 million years ago fossil worm (can move around, think, respond: life. *not really definitions (really severe temperatures have implications on life) Enceladus (6th moon) ice on surface [water on bottom] Formalhaut (25 lightyears away) also the first planet. Goldilocks zone: location just in the right position to sustain life: gaia hypothesis. Earths biosphere is manipulated by life to sustain life itself. The earth therefore, is considered, hypothetically, as if it were a living thing. Extremophiles (life form): chemotrophs: use hydrogen sulfide/water. (because sun is too far from their environment) some believe that this also is the origin of life.

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