The document discusses the lifecycle of stars from their formation to death. It begins by defining what stars and constellations are. It then focuses on our sun as a medium-sized, yellow star at the center of our solar system. Stars are classified based on temperature and brightness as young dwarf stars or older, larger supergiant stars. The document outlines the typical stages a star like the sun will progress through over billions of years from birth from clouds of dust and gas, burning hydrogen through nuclear fusion as a main sequence star, and eventual death through expansion and explosion at the end of its life. Various nebulae and supernova remnants are used as examples of star birth and death.

1. The Life of a Star

2. What is a Star?
• A star is a huge sphere of very
hot glowing gas.
• When stars are grouped
together we call them
constellations.
• The big dipper is constellation
that we see often.
http://en.wikipedia.org/wiki/File:Big_dipper_from_the_kalalau_lookout_
at_the_kokee_state_park_in_hawaii.jpg

3. The Sun
• The Sun is the only star in our solar system
• All eight planets, comets, and an
asteroid belt, revolve around the Sun.
• The Sun is a yellow, medium sized star.
http://en.wikipedia.org/wiki/File:Yohkohimage.gif

4. Classifying Stars
•Stars are classified according
to their temperature and
brightness.
•Hot Stars are Blue or White
•Cooler Stars are Red or Orange

5. Classifying Stars Cont…
•A young star is called a dwarf star
•They can be colored red, yellow, or
white.
• Our Sun is a yellow dwarf
•Older Stars are called Supergiants
•They can be colored red or blue.

6. The Timeline of a Star
• Our Sun is an average star. The chart below shows the lifecycle
of our sun over billions of years.
http://en.wikipedia.org/wiki/File:Solar_Life_Cycle.svg

7. How Stars Are Born
• Star are formed from giant clouds of dust and gas.
• Then, from gravity, the cloud collapses into a rotating gaseous ball.
• Once the new star gets hot enough it will begin to create energy from a
process called nuclear fission.
• This created energy allows the star to glow for billions of years.

8. Where Stars are Born
• The
Eagle
Nebula
http://en.wikipedia.org/wiki/File:Eagle_nebula_pillars.jpg

9. The Death of Stars
•A Star dies when it runs out of
gases to burn.
•The Star will first expand into a
red, super giant.
http://en.wikipedia.org/wiki/File:Betelgeuse_star_%28Hubble%29.jpg

10. The Death of Stars Cont…
•Then the Star will collapse and
explode.
• This takes billions of years.
•The size of the star determines
how long it’s life is.
• The bigger the star the shorter the life.

11. After a Star Explodes…
• The Crab
Nebula
http://en.wikipedia.org/wiki/File:Crab_Nebula.jpg

12. References
• Picture References
• Text References
http://en.wikipedia.org/wiki/File:The_life_of_Sun-like_stars.jpg
"Ask an Astronomer for kids!." Ask an Astronomer for kids!. Web. 25 Feb 2010.
. <http://coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/star.shtml>.
http://en.wikipedia.org/wiki/File:Big_dipper_from_the_kalalau_looko
ut_at_the_kokee_state_park_in_hawaii.jpg
http://en.wikipedia.org/wiki/File:Yohkohimage.gif
"Star Types." Zoom Astronomy. 2010. Enchanted Learning, Web. 1 Mar 2010.
<http://www.enchantedlearning.com/subjects/astronomy/stars/startypes.shtml>.
http://en.wikipedia.org/wiki/File:Solar_Life_Cycle.svg
http://en.wikipedia.org/wiki/File:Eagle_nebula_pillars.jpg
http://en.wikipedia.org/wiki/File:Crab_Nebula.jpg
http://en.wikipedia.org/wiki/File:Betelgeuse_star_%28Hubble%29.jpg