1. Star Life Cycles and the H-R Diagram
Key Question:
How can we use an H-R diagram to know where a star is in its life cycle?

3. Stars
STARS:
a review

4. Main Ideas Stars make light There are different types of stars
Stars have different life cycles

5. Stars make light through fusion
HYDROGEN
HYDROGEN

6. Not everything we see at night is a star.

7. Objects like the moon and planets reflect light from our star, the sun.

8. Which of the following does not reflect light?
A: comets
B: planets
C: Stars
D: Moons

9. There are many different types of stars

10. Since there are so many stars scientists have classified them by
size
temperature
color
brightness

11. To see connections all stars are graphed in the H-R diagram
The H-R Diagram shows the temperature, size and amount of light a star makes.

12. For now, our sun is a MAIN SEQUENCE STAR.
An average mid-life star

13. What type of star would be in this section?
GIANTS OR SUPER GIANTS

14. The life of a star depends on its mass

15. Life of the Sun

16. Life of a Massive Star

17. Which type of star will be part of the sun’s life cycle?
A: neutron star
B: super red giant
C: white dwarf
D: blue dwarf

19. Nebula
a huge cloud of gas (mostly hydrogen) and dust

20. Supernova
An explosion of a large star

21. Dwarf Star
With no more energy flowing outward, nothing prevents gravity from crushing the matter in the core together
When hydrogen fusion stops, the core glows brightly

22. Neutron Star It is smaller than a white dwarf
Its core has collapsed to become very dense

23. Black Hole
This is when an enormous supernova explodes and then the core collapses completely and vanishes
It has a huge amount of gravity

24. Which one should you circle?