CAS ES 105 Lecture 10: EnvironmentalNotes-Dr.A Midterm 1
12 Apr 2016
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An evolving planet: has been undergoing change for 4. 5 bil years, 2 mil years ago it entered an ice age, been warming for 10,000 years and it has greatly accelerated the last century. We live circling a young star (our solar system), part of a galaxy that is part of a universe with billions of galaxies. Melvin slipher-- discovered 12 galaxies beyond the milky way and showed the red shift, a doppler effect indicating we are all speeding away. Arno penzias and robert wilson at bell"s lab in nj 1965, discovered the earth is bathed in cosmic microwave background radiation that comes from everywhere, confirming the. Sun mostly h and he and is 10,000 degrees f (700 mil tons of h by fission going to 695 tons of he per second) formed 4. 5 bil yrs ago. Universe formed 13. 7 bil years ago and matter is distributed unevenly (big bang); at least 125 bil galaxies.
