1. Put these objects in the correct order from largest to smallest:
Star
Galaxy
Planet
Universe

2. Basic Structure (largest to smallest)
Universe

3. Galaxy

4. Solar System (Stars)

5. Planets

6. Galaxies
A collection of billions of stars, gas, and dust, all held together by gravity
Classified by shape into:

7. Elliptical

8. Spiral

9. Barred Spiral

10. Irregular

11. Milky Way Galaxy Spiral Galaxy
Our solar system located on an arm, about 2/3 out from the center

13. Nuclear Fusion Converts lighter elements into heavier elements
Fuels a star

14. Star Life Cycle

15. The life cycle of a star depends on its mass when it forms.

16. Nebula – Gas and dust where stars form

18. Protostar – Initial stage of a star

20. Main Sequence Star – Mid life for a star

21. Red Giants – Older stars

23. Red Supergiants – older stars that are super massive

24. Supernova – Exploding star

26. Planetary Nebula – After a star explodes

29. White Dwarf – dead star

31. Neutron Star – massive dead star

32. Black Hole – supermassive dead star

33. Answer the following in your notes
1. What will the sun become when it reaches old age?
2. What type of star can become a black hole?
3. Predict what will happen to the sun when it reaches old age

34. How do we categorize stars?
Think pair share: are all stars in the universe similar to the sun? If so why, if not what characteristics might be different with different stars

37. Luminosity
Measures how bright a star would be in relation to the sun, if all stars were the same distance from the observer.
The luminosity of a star is related to its size, color, and temperature.

38. Temperature and Color How hot the surface of a star is.
Hottest temperatures are blue, coolest are red.

39. Hertzsprung-Russel Diagram
is a scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.

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41. Hottest Color?
Blue

42. Coolest Color?
Red

43. What is the color of our Sun?
Yellow

44. Brightest and hottest stars?
Blue Supergiants

45. Coolest and dimmest stars?
Red Dwarfs

46. Procyon B is a:
White Dwarf

47. Rigel is a:
Blue Supergia nt

48. Betelgeuse is a:
Red Supergia nt

49. Barnard’s Star is a:
Red Dwarf

50. Our Sun and Alpha Centauri are:
Main Sequence