405 test - 405 test 01:32 What Science Explores and what it...

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Unformatted text preview: 405 test 01:32 What Science Explores and what it cannot tell us • Explores hypotheses to formulate theories about life • NOT o Solution to all problems o Ignorant of rules o The road to the truth o Out to prove anything o 100% certain o final o infallible o unbiased o used properly Basic Requirements of Life • homeostasis • energy acquisition and conservation • self organization • replication • adaption • organic composition • mutation • inheritance Physical Constraints on Life and Time • Absolute zero= 0 K • Speed of light o c= 3 x 10^8 ms^-1 • gravitational constant o G= 6.673 x 10-11 m^3kg^-1s^-2 • Planck Length o 1.616252 x 10^-35m • Planck Time o 10^-43 sec Origin of the Universe • Before Big Bang o No previous era- Began abruptly o Quantum Emergence- develop from primeval state o Multiverse- bud off from eternal space o Cyclic Universe- cycle of expansion collapse expansion Origin and Early History of the Earth • 13.7 bya- The Big Bang • 5 bya- Solar System forms • 4.7 bya to 4.5bya- Earth Forms • 3.5 bya- Earliest Fossils Origin of the Solar System • Hot Origin o 1749- George-Louis Leclerc o comet collision with sun • Planetesimal o Form from dust that collides and sticks o 1905- Thomas Chamberlain and Forest Ray Moulton • Nebular Hypothesis o 1944- Carl Friederich von Weizsacker o 1951- Gerard Kuiper o stars form in dense H clouds, collapse together Panspermia Hypothesis • amino acids form spontaneously under right conditions • seeds from space Heterotrophic v. Autotrophic • Hetro- consume for energy • Auto- produce own energy Origins of Life • Need o Amino acids (backbone of proteins) o...
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This note was uploaded on 09/26/2010 for the course GEO 405 taught by Professor Staff during the Fall '08 term at University of Texas.

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405 test - 405 test 01:32 What Science Explores and what it...

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