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Astronomy 1210 (O'Connell)

Astronomy 1210 (O'Connell). 7. Astronomy Building. McCormick Observatory. Example cosmic time scale : use letters from our textbook:. Now. Years past. Rough Order of Magnitude Estimate = “ ROM ” Very useful for “ scoping out ” concepts

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Astronomy 1210 (O'Connell)

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  1. Astronomy 1210(O'Connell)

  2. 7 Astronomy Building McCormick Observatory

  3. Example cosmic time scale: use letters from our textbook:

  4. Now Years past

  5. Rough Order of Magnitude Estimate = “ROM” Very useful for “scoping out”concepts in astronomy

  6. Sample all-text page

  7. sample count

  8. “ROM” Calculation for Bennett Text as a Cosmic Time Scale Model • Sample a “typical” page (without illustrations) • About 50 letters per line • 58 lines per column • 2 columns per page ----> About 5800 letters per text page

  9. “ROM” Calculation for Bennett Text as a Cosmic Time Scale Model • 5800 letters per page

  10. “ROM” Calculation for Bennett Text as a Cosmic Time Scale Model • 5800 letters per page • x 800 pages ----> About 4.6 million letters

  11. “ROM” Calculation for Bennett Text as a Cosmic Time Scale Model • 5800 letters per page • x 800 pages ----> About 4.6 million letters • Deduct about 40% for pictures: ---> The textbook contains about 2.5 million letters(!)

  12. Age of the Sun?

  13. Age of the Sun? ~ 5 billion years

  14. Age of the Sun? ~ 5 billion years =5,000,000,000 years • Years/letter: 5,000,000,000/2,500,000

  15. Age of the Sun? ~ 5 billion years = 5,000,000,000 years • Years/letter: 5,000,000,000/2,500,000 = 2,000 years per letter(!)

  16. So, if the whole textbook represents the age of the Sun, each letter is equivalent to 2,000 years (or 80 human generations)

  17. Now

  18. 12,000 yrs ago = 10,000 BC Now

  19. 12,000 yrs ago = 10,000 BC Now 1,000,000 yrs ago

  20. 12,000 yrs ago = 10,000 BC Now Homo sapiens rises 1,000,000 yrs ago

  21. 1,000,000 yrs ago

  22. ASTR 1210 PREVIEW

  23. 12 – 21 - 2012

  24. Volcanoes on Mars

  25. “Spirit” “Curiosity” Pathfinder

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