ASTR 110

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
(No Transcript)
4
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
5
The Universe has a morphology like a cosmic web
of gas and matter!
Computer Simulation Box size 3000 Million light
years
Gas
Normal Matter
6
Anatomy of a Galaxy 250,000,000 yr rotation 20
Sun orbits
7
(No Transcript)
8
The Solar System
Relative Sizes
Scale
9
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
10
Planetary Nebulae
White Dwarf
The Suns Fate
11
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
12
BOOM!
Carbon, nitrogen, oxygen are blasted into
interstellar space!
13
Supernovae Remnants in Our Galaxy
Young
Old
Fate of very Massive Stars
Supernova in a distant galaxy.
14
(No Transcript)