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ASTR 110 Section 3 Dr. Chris Churchill Glenn Kacprzak Paul Strycker

ASTR 110 Section 3 Dr. Chris Churchill Glenn Kacprzak Paul Strycker book: HORIZONS, 9 th ed. by Michael Seeds. 5. Galaxy Cluster. 3. Galaxy (stellar system). 4. Galaxy Group (several galaxies). 2. Planetary System (with star). 1. Planet (ecosphere). Distance measured in “light time”

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ASTR 110 Section 3 Dr. Chris Churchill Glenn Kacprzak Paul Strycker

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  1. ASTR 110 Section 3 Dr. Chris Churchill Glenn Kacprzak Paul Strycker book: HORIZONS, 9th ed. by Michael Seeds

  2. 5. Galaxy Cluster 3. Galaxy (stellar system) 4. Galaxy Group (several galaxies) 2. Planetary System (with star) 1. Planet (ecosphere)

  3. Distance measured in “light time” speed of light = 300,000 km/s = 186,000 miles/sec Sun-Earth distance….......... 8 light minutes Solar System diameter……. 22 light hours Nearest Star………………… 4 light years (lys) Galaxy diameter………........ 100,000 lys Local Group diameter……… 1,000,000 lys Galaxy Cluster diameter…... 100,000,000 lys Size of Universe……………. 12,000,000,000 lys

  4. The Universe has a morphology like a cosmic web of gas and matter! Computer Simulation: Box size 3000 Million light years Gas Normal Matter

  5. Anatomy of a Galaxy 250,000,000 yr rotation 20 Sun orbits

  6. The Solar System Relative Sizes… Scale…

  7. A Star a balance between gravity and pressure core Gravity tends to crush the star, which causes the temperature and the density to increase toward the center. The very center is called the core. In the core the density is ~150 times that of water and the temperature is 15 million degrees Kelvin

  8. Planetary Nebulae The Sun’s Fate White Dwarf

  9. Massive stars undergo multi-layered shell burning. The time duration that each shell burns becomes shorter and shorter as the star becomes desperate to battle against the merciless crushing force of its own gravity. Hydrogen .…… 7 million yrs Oxygen ………. ½ yr Helium …….…. 500 thousand yrs Silicon ……….. 1 day Carbon …….… 600 yrs Iron collapse … 0.1 second

  10. BOOM! Carbon, nitrogen, oxygen are blasted into interstellar space!

  11. Supernovae Remnants in Our Galaxy Young Old Fate of very Massive Stars… Supernova in a distant galaxy.

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