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History of the Earth Chapter 9. Syst ème International (SI). Adopted in 1960 Fundamental Units of measurement meter, gram, second ampere, radian, steradian mole, candela, kelvin Scientific Notation based on powers of 10 3.67 X 10 4 = 36,700. Powers of 10 Logarithmic Scale.

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syst me international si
Système International (SI)
  • Adopted in 1960
  • Fundamental Units of measurement
    • meter, gram, second
    • ampere, radian, steradian
    • mole, candela, kelvin
  • Scientific Notation based on powers of 10
    • 3.67 X 104 = 36,700
powers of 10 logarithmic scale
Powers of 10Logarithmic Scale
  • 100 = 1
  • 101 = 10 10-1 = .1
  • 102 = 100 10-2 = .01 c
  • centi
  • 103 = 1,000 k 10-3 = .001 m
  • kilo milli
  • 106 = Million M 10-6 millionth μ
  • mega micro
  • 109 = Billion G 10-9 billionth n
  • giganano
how old is the earth
How old is the Earth?
  • Numerous mythical or religious accounts
    • Babylonian, Druidic, Egyptian, Hebraic,
    • Hindu, Mayan, Norse, Sumerian
  • 4th century Saint Augustine ≈ 6 ka
  • 1654 James Usher
    • The universe separated from the void at 9 A.M. on Sunday October 23, 4004 BC (bce)
  • 1956 Clair Patterson Pb/Pb ≈ 4.56 Ga
interstellar stuff
Interstellar Stuff
  • Calculations suggest that there is lots of stuff not in observed bodies
  • Stars form where stuff is compressed at the leading edge of a galaxy
  • Not all stuff into stars
  • Stuff not uniformly distributed
compression on leading edge
Younger stars on leading edge

Older stars on training edge

Knots of stuff yet to be compresses

Knots of stuff from stars that went bad

Compression on leading edge
controls of stellar fusion
Controls of Stellar Fusion
  • Fuel
  • Pressure
  • Temperature
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Shield

Craton

Platform