1. LIFE AND DEATH OF STARS

3. NEBULA Cloud of swirling gas and dust where stars are born
Gravity causes matter to condense
Will turn into a ….

4. PROTOSTAR The beginning of a star. It has not begun fusing matter yet.
It then can turn into a…

5. Main Sequence Stars
WHEN THE PROTOSTAR IS DENSE & HOT ENOUGH IT WILL BEGIN FUSION & LIGHT UP!
HYDROGEN IS BEING CONVERTED TO HELIUM
IT IS NOW A MAIN SEQUENCE STAR!

6. 1 OF 3 MAIN SEQUENCE STARS RED DWARF (SMALL)
A small star that lives billions of years
Or a ….

7. MAIN SEQUENCE STAR YELLOW STAR (MEDIUM)
A medium star
Shorter lived than a red dwarf but still lives billions of years
But sometimes a protostar turns into a…

8. MAIN SEQUENCE BLUE GIANT (LARGE)
A large star
It has the shortest life span
Living only millions of years….
However…..

9. RED GIANTS (form from small & medium sized main sequence stars)
Evolves from either a red dwarf or a yellow star
Red giants begin to lose energy when most of its matter fuses into bigger elements
Helium converts to carbon & oxygen
Causing it to expand and engulf nearby planets
Which then turns into a…

10. WHITE DWARF It cools and contracts
Helium runs out & core contracts, outer layers leave and produces this small dense star
Finally it becomes a…

11. BLACK DWARF It eventually cools
It becomes a big “charcoal piece” in space
But remember ….

13. BLUE GIANT (large sized main sequence star)
It takes another path in its life cycle
It becomes a…

14. RED SUPER GIANT Loses energy Matter fused into bigger elements
Fusion occurs until iron core is reached
It expands engulfing nearby objects
Then it becomes a …

15. SUPER NOVA Very large stars explode when they contract
Forms heavier elements like gold or lead
Then it becomes either a…

16. BLACK HOLE or NEUTRON STAR (Pulsar)
A dead star so dense even light can’t escape
A very dense dead star
So….

17. SMALLEST STARS
ABOUT 70X JUPITER
NO FUSION
BURN HYDROGEN-2 TO LITHIUM
SPECTRAL TYPE M,L,T,Y
COLOR MAGENTA

18. The Hertzsprung-Russell Diagram
An H-R diagram plots stars according to their luminosity and temperature (or spectral class)
2/17/2019

19. REVIEW OF STARS LIFE CYCLE Nebula to proto star

20. Proto star to either red dwarf, yellow star or blue giant

21. Red dwarf or yellow star (small & medium sized) becomes a red giant

22. Red giant becomes a white dwarf and then a black dwarf

23. A blue giant (large star) becomes a red super giant

24. A red super giant then becomes a super nova and then either a black hole or neutron star

25. May 2006April 2004
Belinda Wilkes