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Topic: Life Cycle of a Star
Essential Question: What determines the life cycle of a star?
To put the size of stars into perspective…
• Star's Sizes video (2:34 long)
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
Stellar Nebula (1st Stage)
• A ball of gas and dust that is pulled together by gravity
• Hydrogen atoms fuse into Helium atoms which creates energy
• The energy is SO powerful that it ignites
Pillars of Creation: The Eagle Nebula
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
Main Sequence (2nd Stage)
• Hydrogen is fusing into helium at its core (center) which gives off a lot of heat
• An average size star can last 10 Billion years
• A massive star’s main sequence is much shorter because it burns through its Hydrogen much faster
• Massive stars burn hotter and brighter than average size stars
The Sun: An Average size star in its Main Sequence
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
Average Size Star Massive Star
3rd Stage of a star’s life
Red Giant
Star begins to burn all of
its hydrogen.
The outer layers will
collapse, become heated by
the core and expand out
forming a red giant.
Super Red GiantThe hydrogen has turned into helium
This star has a helium core
The core is surrounded by gas that is cooling off and expanding
Red Giant in comparison to the Sun
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
4th Stage of a star’s life
Average Size Star Massive Star
Planetary NebulaCore of the star contracts and the leftover helium atoms fuse into carbon
Energy is released and the outer layers of the star begin to drift into outer space
Star loses most of its mass
Supernova
Gravity causes the core of
the star to collapse at a very
high speed
This creates an explosion;
the brightest, most powerful
explosion that exists
Planetary Nebula Supernova
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
5th Stage of a Star’s life
Average Size StarWhite Dwarf
The leftover center of a planetary nebula
Made of highly compressed carbon
Can shine for billions of years
White Dwarfs
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
5th Stage of a Massive Star’s life
Black HoleNeutron Star
The core that is left over after a supernova
Made of neutrons
Gravity is so powerful that the core spins at a very fast speed
Only happens if the star is less than 3 solar masses
Happens if the star is
more than 3 solar masses
Core leftover from a supernova will collapse and form a black hole
Gravity is SO powerful, that not even light can escape it
Neutron StarBlack Hole
Now take some time…
• Take 2 minutes to go over your notes and highlight or underline the main ideas that answer the essential question, you should nothighlight everything:
• Essential Question: What determines the life cycle of a star?
Time to use the left hand column
• You will now write your own questions using the verbs provided.
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
Stellar Nebula (1st Stage)
• A ball of gas and dust that is pulled together by gravity
• Hydrogen atoms fuse into Helium atoms which creates energy
• The energy is SO powerful that it ignites
Choose one verb to
write your question:
Define
Describe
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
Main Sequence (2nd Stage)
• Hydrogen is fusing into helium at its core (center) which gives off a lot of heat
• An average size star can last 10 Billion years
• A massive star’s main sequence is much shorter because it burns through its Hydrogen much faster
• Massive stars burn hotter and brighter than average size stars
Choose one verb to
write your question:
Define
Describe
Compare
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
Average Size Star Massive Star
Red Giant
Star begins to burn all of
its hydrogen.
The outer layers will
collapse, become heated
by the core and expand
out forming a red giant.
Super Red GiantThe hydrogen has turned into helium
This star has a helium core
The core is surrounded by gas that is cooling off and expanding
3rd Stage of a star’s lifeChoose one verb to
write your question:
Define
Describe
Compare
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
4th Stage of a star’s life
Average Size Star Massive Star
Planetary NebulaCore of the star contracts and the leftover helium atoms fuse into carbon
Energy is released and the outer layers of the star begin to drift into outer space
Star loses most of its mass
SupernovaGravity causes the core of the star to collapse at a very high speed
This creates an explosion; the brightest, most powerful explosion that exists
Choose one verb to
write your question:
Define
Describe
Compare
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
5th Stage of a Star’s life
Average Size StarWhite Dwarf
The leftover center of a planetary nebula
Made of highly compressed carbon
Can shine for billions of years
Choose one verb to
write your question:
Define
Describe
Compare
Topic: Life Cycle of a StarEssential Question: What determines the life cycle of a star?
5th Stage of a Massive Star’s life
Black Hole
Happens if the star is more
than 3 solar masses
Core leftover from a supernova will collapse and form a black hole
Gravity is SO powerful, that not even light can escape it
Neutron Star
The core that is left over after a supernova
Made of neutrons
Gravity is so powerful that the core spins at a very fast speed
Only happens if the star is less than 3 solar masses
Choose one verb to
write your question:
Define
Describe
Compare
Now let’s write a summary
Look at each question you wrote on your own, and answer each question in a complete sentence.