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GALAXIES Pages
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Galaxies large groups of stars (approx. 100 billion) bound by gravitational attraction- rotates around a center PLUS: nebulae, planets, dark matter (90%), space, etc..
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CENTER OF GALAXIES Supermassive black hole
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Supermassive black hole
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Milky Way Barred spiral galaxy About 100,000 light-years wide
Sun is 30,000 light-years from the center Rotates every 200 million years around “galactic center”
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Milky Way
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Face-on view of the Milk Way Galaxy
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Edge-on view of the Milk Way Galaxy
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Andromeda (M31) A large galaxy neighbor 2,200,000 ly
Can see with naked eye
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Clash of Andromeda and Milky Way
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Types of Galaxies
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NGC 3384 M105
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Spiral galaxies NCG 6946 30% of all galaxies
Older in center; younger in arms NCG 6946
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A barred spiral galaxy
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Elliptical galaxy 60% of all galaxies Contain older stars
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Merger of two Spirals to form an Elliptical
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M104 (The Sombrero Galaxy)
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Irregular galaxy 10% of all galaxies Contain young stars
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Hubble’s Law Farther galaxies are moving away faster than closer galaxies
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Raisin bread analogy of an expanding universe
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What does this support? EXPANDING UNIVERSE!
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Local group Local Group Milky way and it’s nearest galaxies
Contains at least 28 galaxies
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What pattern do galaxies form in the universe?
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AMAZING FACT Our known Universe (are there more?) contains at least 1,000,000 billions ( Thats One Million, Billions) of other Galaxies...like our own Milky Way. Life?
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What is your galactic address?
Smallest to largest:
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Power of Ten
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Galaxy Song https://www.youtube.com/watch?v=XNj-_705LcA
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