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Transcript 
Star Groups
Chapter 27 (p. 561-565)
Galaxies
• Def: large groups of stars (approx. 100
billion) bound by gravitational attraction
• Also contain gas and dust clouds (nebulae)
• Nearest Galaxies
– Large Magellanic Cloud (LMC) (150 m.l.y.)
LMC
SMC
Types of Galaxies
• Spiraloutstretched
curving arms
M100
NGC 3370
Barred spiral
• Like a spiral but has a bar going through the
center
NCG 6946
Elliptical galaxies
• Round to oblong in shape
NCG 4565
M104 (The Sombrero Galaxy)
M-81 (Andromeda Galaxy)
NCG 4636
NGC 720
Irregular
• No specific shape
• No symmetry
NCG 1705
G1- Globular Cluster
Omega-Centauri
M 80 Globular Cluster
NCG 6822
Our Milky Way
Milky Way
• Structure
• Barred spiral galaxy
• About 100,000 lightyears wide
• Sun is 30,000 light-years
from the center
• Rotates every 200 million
years around “galactic
center”
Milky Way
Face-on view of the
Milk Way Galaxy
Edge-on view of the
Milk Way Galaxy
Is the center of every galaxy a
supermassive black hole?
NGC 3384
M105
Hubble deep field
Merger of two Spirals to form an Elliptical
Colliding galaxies movie
• http://wps.prenhall.com/wps/media/objects/
680/696364/ifa_colliding_galaxies.mpg
Local group
• Local Group
• Milky way and nearest
galaxies
• Contains at least 28
galaxies
LARGEST TO SMALLEST
•
•
•
•
UNIVERSE
LOCAL GROUPS
GALAXIES
SOLAR SYTEMS
Power of Ten
• http://micro.magnet.fsu.edu/primer/java/scie
nceopticsu/powersof10/index.html
Galaxy Song
from Monty Python
• http://www.youtube.com/watch?v=mEY6Y
ojnex0&feature=related&safety_mode=true
&persist_safety_mode=1
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