PCS 182 Lecture Notes - Lecture 7: Galaxy 4, Acute Radiation Syndrome, Reproducibility
27 Jul 2017
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The scientific method: observation, hypothesis, experiment, conclusion, reproducibility. Respirate: o2 in -> oxidation + o2 combine with organic molecules and releases chemical energy. > co2 (carbon dioxide) & h20 (water) out. Secrete: to generate saliva, mucus, milk, hormones, digestive juices. Environmental requirements for life: mass star, our star is 4. 5 billion years old, age of our sun / earth system: 4. 54 billion years, earth"s life arose (cid:449)he(cid:374) syste(cid:373) was ~ 1 billion years old (~3. 7 billion years ago) Star must live long enough for biology to develop on one of its planets. M a(cid:374)d m stars . pro(cid:271)a(cid:271)ly no life: massive planet(s): Will gravitationally attract/deflect incoming comets, meteors, asteroids that might cause mass extinctions if they impacted a smaller, bio-planet in system): radiation levels: Invisible and nasty: radiation can damage dna in cells cells: may stop functioning properly. Fail to reproduce: cancer is chaotic production of cells, radiation induce reproductive sterility in organism.
