Astronomy Day 10: The Life Cycle of Stars

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Astronomy Day 10 The Life Cycle of Stars

• Goals
• Explain the steps in the lifecycle of a small,
  medium, and large mass star.
• Explain how the 2 forces that act on a star
  influence its lifecycle.

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Bell Ringer

• What happens to stars when they die?
• What event stops when they die?
• Where do they go when they die?

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Bell Ringer

• Explain the connection between gravity and the
  formation of stars

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Life Cycle of Stars

• A stars lifecycle depends on its mass at the
  moment it becomes a star (when fusion starts)
• Star lifecycles are divided into 3 categories
• Small stars (like our sun) (Up to 1.5 Solar
  masses
• Medium stars (1.5 to 3 Solar Masses)
• Large stars (greater than 3 Solar Masses)

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Small Stars
 Main Sequence
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Small Stars
 Main Sequence
Red Giant
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Small Stars
 Main Sequence
Red Giant
White Dwarf Planetary Nebula
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Planetary Nebula
White Dwarf
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Small Stars
 Main Sequence
Red Giant
White Dwarf Planetary Nebula
Black Dwarf
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Small Stars
 Main Sequence
Red Giant
White Dwarf Planetary Nebula
Black Dwarf
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After our sun burns its supply of hydrogen it
will evolve into

• White dwarf
• Black dwarf
• Black hole
• Red giant
• White giant

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Medium Stars

• Main Sequence

Supergiant
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Medium Stars

• Main Sequence

Supergiant
Supernova
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Supernova
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Medium Stars

• Main Sequence

Supergiant
Supernova
Neutron Star
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Medium Stars

• Main Sequence

Supergiant
Supernova
Neutron Star
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A white dwarf is a former

• Low mass star
• Medium mass star
• High mass star

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Medium Stars

• Main Sequence

Supergiant
Supernova
Black Hole
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Companion Star
Black Hole
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A black hole is

• An empty region of space with a huge
  gravitational field
• A small region of space with the mass of many
  galaxies
• The remains of a giant collapsed star

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ActivityLife Cycle of Stars movie/ presentation

• Your presentation/movie must meet the following
  criteria
• Be 2-5 minutes in length
• Must include the entire life cycle of one type of
  star (small, medium, or large) from its formation
  until its final stage.
• Can use any movie making program and video from
  your cell phones, but it must be original student
  work

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So what kind of things can you do for this
presentation?

• Cartoon
• Story
• Skit
• Puppet show
• Song
• Rap
• Interpretive dance

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So what kinds of vocabulary should be in the
presentation?

• nebula
• hydrogen
• helium
• thermonuclear
• fusion
• gravity
• protostar
• Mass
• main sequence

• temperature
• luminosity
• small mass
• stars
• medium mass
• stars
• large mass
• stars
• HR Diagram

• red giant
• supergiant
• white dwarf
• planetary nebula
• black dwarf
• nova
• supernova
• heavy elements
• black hole

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Homeworkfinish this concept map
Life Cycle of Stars
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Ticket out

• Using a graphic organizer, explain the steps in
  the life cycle of a small, medium, and large
  star. Be sure to include the forces that act on
  the star as it ages.