1. GALAXIES
Pages

2. Galaxies
large groups of stars (approx. 100 billion) bound by gravitational attraction- rotates around a center
PLUS: nebulae, planets, dark matter (90%), space, etc..

3. CENTER OF GALAXIES
Supermassive black hole

4. Supermassive black hole

5. 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”

6. Milky Way

7. Face-on view of the Milk Way Galaxy

8. Edge-on view of the Milk Way Galaxy

9. Andromeda (M31) A large galaxy neighbor 2,200,000 ly
Can see with naked eye

10. Clash of Andromeda and Milky Way

11. Types of Galaxies

12. NGC 3384
M105

13. Spiral galaxies NCG 6946 30% of all galaxies
Older in center; younger in arms
NCG 6946

14. A barred spiral galaxy

16. Elliptical galaxy
60% of all galaxies
Contain older stars

17. Merger of two Spirals to form an Elliptical

18. M104 (The Sombrero Galaxy)

19. Irregular galaxy
10% of all galaxies
Contain young stars

20. Hubble’s Law
Farther galaxies are moving away faster than closer galaxies

22. Raisin bread analogy of an expanding universe

23. What does this support?
EXPANDING UNIVERSE!

24. Local group Local Group Milky way and it’s nearest galaxies
Contains at least 28 galaxies

25. What pattern do galaxies form in the universe?

26. 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?

27. What is your galactic address?
Smallest to largest:

28. Power of Ten

29. Galaxy Song https://www.youtube.com/watch?v=XNj-_705LcA