Lec03_BigBang_2_present - What is the Earth made of? Atomic...

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1 What is the Earth made of? About 26 of the chemical elements comprise all of life. C, H, O, N, P and S are the major constituents of living tissue and comprise 95% of the biosphere Atomic Number = No. of protons in nucleus = No. of electrons in orbit Atomic Weight = protons + neutrons
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2 Relative Abundance of Elements in the Universe - clue to the origin of the elements Light elements more abundant than heavy elements Even-numbered elements more abundant than odd- Elements with Z>30 more similar in abundance Li, Be, B are anomalously rare Atomic Number Z
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3 Earth is part of the Solar System • Sun + • 8 major planets in unique orbits + moons • Two belts of smaller objects (minor planets, planetoids, meteoroids, planetesimals) 1 AU = 1 astronomical Unit = Sun-Earth distance = 149 598 000 km Jupiter: 5.2 AU Pluto id : 38 AU
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4 Solar System is part of … •Universe – Observed to be expanding Æ Formed from Big Bang ~ 13.7±0.2 Billion ago. •Galaxy : Milky Way (~200 billion stars + planetary systems)
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5 Evidence for the Expanding Universe • Red Shift – Edwin Hubble (1931): the light from dimmer (more distant) stars are shifted towards longer (redder) wavelengths than brighter (closer) stars • Distant galaxies are moving away from Earth observers at incredible speeds!
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This note was uploaded on 07/08/2010 for the course ENV SCI 10 taught by Professor Staff during the Spring '08 term at University of California, Berkeley.

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Lec03_BigBang_2_present - What is the Earth made of? Atomic...

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