STARS LECTURE

Presentation

•

Science

•

8th Grade

•

Medium

•

NGSS

HS-ESS1-3, HS-ESS1-1, MS-PS3-4

Standards-aligned

Janet Webster

Used 7+ times

FREE Resource

88 Slides • 28 Questions

TEKS 8.9A, 8.2B

Stars

KEY IDEAS

• What is the life cycle of a star?
• What is a Hertzsprung-Russell diagram?
• How can you use a Hertzsprung-Russell

diagram to compare and classify stars?

Words to Know

star

light-year

luminosity

Hertzsprung-Russell diagram

TEKS 8.9A, 8.2B

Stars

KEY IDEAS

• What is the life cycle of a star?
• What is a Hertzsprung-Russell diagram?
• How can you use a Hertzsprung-Russell

diagram to compare and classify stars?

Words to Know

star

light-year

luminosity

Hertzsprung-Russell diagram

What is the life cycle of a star?

What is the life cycle of a star? continued

A star is a giant ball of hot gas, mainly composed of hydrogen and
helium. A light-year is the distance that a star’s light travels in one year.

All stars have a life cycle in which they form, develop, and cease to shine
when they run out of fuel.

Multiple Choice

Which is an accurate description of determining a stars life span?

the less mass of the star the longer the life span

stars never die

all stars shine the same

stars don't have a life cycle

Multiple Choice

What determines the life cycle path that a star will take?

Mass of the star

Temperature of the star

Location of the star

Speed of a star's rotation

Classifying Stars - Presentation

Share what you already know
about the Essential Questions.

•

Can you describe the life cycle
of a star?

•

How do we use the H-R
Diagram to help to compare
and classify stars?

Your answer:

Essential
Questions

Classifying Stars - Presentation

Life Cycle of a
Star

•

A star’s life cycle is the
sequence of changes
that occur in a star as it
ages.

•

Even though we call it a
life cycle, stars are not
actually alive!

Are stars alive if they
have
a life cycle?

Your answer:

Classifying Stars - Presentation

Where Do Stars Come
From?
•

Stars are “born” from
interstellar mediums
which are areas of thinly
spread gas and dust.

•

The gas of these interstellar
mediums is mostly
hydrogen.

•

The dust is composed of
mostly carbon (C) and
silicon (Si).

What two elements
are most of the dust
in interstellar
mediums made of?

Your answer:

Open Ended

What two elements are most interstellar dust made of?

Type response here

Classifying Stars - Presentation

Consider the life cycle of
a grasshopper to the
right. It starts as an egg,
hatches into a nymph,
and then matures into an
adult.
It goes through three
different stages during its
life. Tell your
partner/neighbor why you
may think they call the
life of a star a “life cycle.”

Brain

Break

Open Ended

How is the life cycle of the STAR like a grasshoper?

Type response here

Classifying Stars - Presentation

Nebulas

•

When gravity attracts
the substances in
interstellar mediums,
they begin to collect into
big clouds called
nebulas.

•

Nebulas are the
birthplace of stars, as
stars are made up of gas
and dust.

•

Also known as a “star
nursery,” nebulas are
where young stars begin
to form.

Why would they call
nebulas star
nurseries?

Your answer:

Classifying Stars - Presentation

Protostar

•

Inside the nebula are regions
of greater and lesser gravity,
causing the gas and dust to pull
together.

•

As more atoms gather, their
gravitational attraction
increases.

•

This is where a protostar
forms. In this state, the star is
unstable, due to many reactions
occurring within the protostar.

Classifying Stars - Presentation

A Star Is Born!

•

When the core of a
protostar reaches
around 15 million
degrees Celsius,
nuclear fusion reactions
begin.

•

This reaction causes
hydrogen (H) to fuse
into helium (He) and
releases a tremendous
amount of light and
heat.

At what temperature
does nuclear fusion
begin?

Your answer:

Classifying Stars - Presentation

Before a star is “born” it has
already gone through the early
stages of its life. Even though a
star’s life cycle begins as gas and
dust and then becomes a
protostar, it is not considered a
star before the end of the
protostar phase.

What evidence have you been
provided that could support why
the end of the protostar phase is
the point where a star is born?

Ask Questions and

Define Problems

Your answer:

Think

About It

Classifying Stars - Presentation

Main Sequence Stars

•

Once nuclear fusion begins
in a star, it reaches the
main sequence phase of
its life.

•

It is estimated that 90%
of all stars in the universe
are main sequence.

•

These stars radiate (shine)
energy into space in the
form of light and heat.

Classifying Stars - Presentation

•

Depending on the
amount of gas and
dust available from a
star's birth nebula, it
becomes either an
average or a massive
star during the main
sequence phase.

•

Smaller, average stars
have different life
paths than more
massive stars.

Different Paths

Classifying Stars - Presentation

Low Mass/Average Stars in the
Main Sequence
•

The mass of a star
determines what
happens to it after
living most of its life in
main sequence.

•

Low-mass starsin
the main sequence are
cooler and have a
reddish appearance.

What color are low-mass stars
in the main sequence?

Your answer:

Classifying Stars - Presentation

Red Giants

•

Red giantis the next phase
after main sequence stars.

•

Both low-mass and high-mass
main sequence stars can
progress to be red giants next.

•

The outer gas layers of the star
expand, and as the star uses all
its fuel, its core shrinks.

•

They are red in color and have
high luminosity.

Classifying Stars - Presentation

Planetary
Nebula
•

Planetary nebulas
occur at the end of a
low-mass red giant’s
life.

•

The outer layers of
the star are expelled
into space and
appear as brightly
colored clouds.

•

The leftover core is
extremely hot and
luminous and
becomes a white
dwarf star.

Classifying Stars - Presentation

White Dwarf(Burning OUT)

•

A white dwarf forms
when a low-mass star
runs out of fuel.

•

They become the core
of a planetary nebula.

•

They are incredibly
dense with
a gravity that is
350,000 times that of
gravity on Earth!

•

They will change
colors as they cool.
=Red dwarfs

Classifying Stars - Presentation

Black Dwarf

•

A black dwarfis the end
product of a white dwarf star.

•

They are the last stage of
stellar evolution for low-mass
stars.

•

A black dwarf no longer emits
heat or light and is no longer
considered a star.

Classifying Stars - Presentation

Match the phases of the life cycle of a low-mass star
to its image.

Quick Action:

INB

Classifying Stars - Presentation

Brain

Break

Discuss with your
partner/neighbor
why you think that
once a low-mass star
becomes a black
dwarf, it is no longer
considered a star.
What characteristics
does it have/not
have that support
your argument?

Multiple Choice

Stars can take different paths due to having different _____________

temperature

mass

brightness

color

Multiple Choice

All stars start as gas and dust in a(n)

nebula

black hole

red giant

black dwarf

Multiple Choice

After the main sequence, a low mass star becomes a

black dwarf

protostar

red giant

supergiant

Multiple Choice

After the main sequence, a low mass star becomes a

black dwarf

protostar

red giant

supergiant

Multiple Choice

After a supergiant, a high mass star explodes and forms a

supernova

red giant

black hole

planetary nebula

Multiple Choice

When a nebula heats up, a "baby" star forms in the middle. It is called a

supernova

supergiant

white dwarf

protostar

Multiple Choice

Most stars are?

Red giants

White dwarfs

Main sequence

Supergiants

Classifying Stars - Presentation

High Mass/Average Stars in the
Main Sequence
•

The mass of a star
determines what
happens to it after
living most of its life
in main sequence.

•

High-mass starsin
the main sequence
are hotter and have a
blue or white
appearance.
What type of stars are hotter,
low-mass or high-mass stars?

Your answer:

Classifying Stars - Presentation

Red Supergiants and Blue

Giants

•

Red supergiantor blue
giantis the next phase
after main sequence star.

•

Both low-mass and
high-mass main sequence
stars can progress to be
red giants first.

•

In red supergiant and blue giant stars, the
outer gas layers of the star expand and, as
the star uses all its fuel, its core shrinks.

•

They are red or blue in color and have high
luminosity.

Classifying Stars - Presentation

Supernova

•

A supernova is the last
stage of a high-mass star’s
life.

•

Supernovas occur as the
star runs out of nuclear
fuel and some of its mass
flows into
its core.

•

Its core becomes so heavy
that it cannot withstand its
own gravitational force.

•

This causes the core to
collapse and results in a
giant explosion!

Classifying Stars - Presentation

•

A neutron star is the very dense core
left behind after a supernova.

•

1 teaspoon of a neutron star would have a
mass of over 1 billion tons!

•

Their gravity is 2 billion times that of
Earth’s gravity.

•

A neutron star’s gravity presses its material
in on itself so tightly that protons (+) and
electrons (-) combine to make neutrons,
yielding the name “neutron star.”

Neutron Star

Why do they call these stars
neutron stars?

Classifying Stars - Presentation

Black Hole

•

A black hole formswhen
very massive stars collapse
at the end of their life
cycle.

•

They are a large area in
space and have a very
strong gravitational pull.

•

Their gravity is so strong
that nothing can escape
them, not even light!

Classifying Stars - Presentation

Quick Action:

INB

Match the phases of the life cycle of a high-mass star to
its image.

Multiple Choice

Identify the Stage of this Star's life cycle

Nebula

Red Giant

Super Red Giant

Planetary Nebula

Multiple Choice

Identify the Stage of this Star's life cycle

Red Giant

High Mass

Super Red Giant

Main Sequence

Multiple Choice

Identify the Stage of this Star's life cycle

Black Hole

White Dwarf

Neutron Star

Planetary Nebula

Multiple Choice

If the mass of the star is high enough, a Type II Supernova can result in a black hole. A black hole is created when...

Gravity overcomes neutron forces

Gravity overcomes electron forces

Gravity overcomes gravity

Classifying Stars - Presentation

The life cycle of all stars follows a pattern. Both
low-mass and high-mass stars have a birthplace phase,
an early formation phase, a stable phase, an expansion
phase, and an end phase. Using terms from this
presentation - nebulas, protostars, main sequence stars,
red giants, red/blue supergiants, white dwarves, black
dwarves, supernova, and neutron star – find the pattern
that will take both low-mass and high-mass stars from
“birth” to “death.”

Patterns

Your answer:

Think

About It

birthplace

phase

formation

phase

stable
phase

expansion

phase

end

phase

Classifying Stars - Presentation

What color is the highest temperature on the H-R Diagram?

Your answer:

H-R Diagram

•

The Hertzsprung-Russel
Diagram, or H-R Diagram,
plots each star on a graph and
measures the star’s magnitude
(luminosity / brightness)
against its temperature
(color).

•

We use the H-R Diagram to
compare and classify stars!

Classifying Stars - Presentation

Temperature (K)

•

A star's temperature is
measured in Kelvin
(K).

•

The color of stars
depends
on their temperature.

•

The coolest stars are
red and the hottest
stars are blue.

Classifying Stars - Presentation

Luminosity

•

Luminosity is the amount
of energy (light) a star emits.

•

It is how bright a star is.

•

Luminosity is determined
by the size and temperature of
the star.

Multiple Choice

The luminosity of a star describes its ______________.

brightness

temperature

age

color

Multiple Choice

As the _________ of a star increases, luminosity increases.

size

distance

age

composition

Multiple Choice

What color are the hottest stars?

blue

red

white

yellow

Multiple Choice

A star's luminosity is a measure of how ___________ the star is

big

bright

hot

massive

Multiple Choice

In the diagram given, what happens as we move to the left?

Stars Get Larger

Stars get Colder

Stars get hotter

Multiple Choice

Which category is our Sun located in?

White Dwarfs

Supergiants

Main Sequence

Giants

Multiple Choice

Look at the H-R diagram. Which star is
sort of cool, dim (not too much light), and red?

Betelguse

Sirius B

Procyon B

Barnard's star

Multiple Choice

Which star has the lowest temperature?

Multiple Choice

The HR Diagram shows a relationship of a star's surface temperature and its

color

size

apparent magnitude

absolute magnitude

Multiple Choice

The effective temperature of a star is related to its...

solar system

luminosity

absolute magnitude

color

Multiple Choice

Use the diagram to answer the question.Using the figure, Aldebaran, Mira, and Pollux are all _____ stars.

giant

supergiant

main-sequence

white dwarf

Multiple Choice

Use the Hertzsprung-Russell Diagram to answer the following question. Betelgeuse is a _____

Hot and Bright Star

Cool and Bright Star

Hot and Dim Star

Cool and Dim Star

Multiple Choice

Use the Hertzsprung-Russell Diagram to answer the following question. Spica is a _____

Hot and Bright Star

Cool and Bright Star

Hot and Dim Star

Cool and Dim Star

Classifying Stars - Presentation

Magnitude

Magnitude measures
a star’s brightness or
luminosity.

•

The lower the
magnitude, the more
luminous the
star is.MORE SHINY
BRIGHTEST

•

The higher the
magnitude, the less
luminous a star is.

•

LESS SHINY,
DIMMEST!

Classifying Stars - Presentation

Have you ever seen a car
approaching you at night with its
headlights on from a long
distance? As it gets closer to
you, what happens to the
appearance of the headlights?
Do they look bigger, brighter?
Discuss with your
partner/neighbor why you think
the headlights look different
depending on how close or far
away you are from them!

Brain

Break

Classifying Stars - Presentation

•

Apparent magnitude (m)
is how bright an object
appears from Earth, or
where you are observing
from.

•

Absolute magnitude (M)
is the measure of a star’s
brightness as if it were at a
standard distance of
exactly 10 parsecs (32.6
light years) from
the observer.

Apparent vs. Absolute Magnitude

Classifying Stars - Presentation

Star
Magnitud

Temperat

ure

Type of

Star

- 8 M

white
dwarf

3,200 K

main

sequenc

1 M

Quick Action:

INB

Use the image and table below to classify stars using
the H-R Diagram.

Classifying Stars - Presentation

Low-Ma
ss
Life
Cycle

High-M
ass
Life
Cycle

main

sequen

red

giant

planeta

nebula

white
dwarf

nebul

main

sequen

red/blu
e giant

superno

neutro
n star

black
hole

Last

Look

The details of four stars can be found in the table below. Using
what you know about stars and the H-R diagram, identify what
stage each star is in by matching each letter icon to its correct
location on the life cycle of low- and high-mass stars.

Classifying Stars - Presentation

Check for Understanding

Can you describe the life cycle of
a star?

How do we use the H-R Diagram
to help
to compare and classify stars?

Your answer:

Classifying Stars - Presentation

Which part(s) of the Essential
Question(s) do you still need help to
understand?

Still Have Questions?

Your answer:

What is an H-R diagram?

What is an H-R diagram? continued

A star’s temperature is related to
its luminosity, the amount of
energy it emits from its surface.

The Hertzsprung-Russell
diagram, or H-R diagram, is a
graph that shows the temperature
and luminosity of different stars.

How can you use a Hertzsprung-Russell
diagram to compare and classify stars?

Use H-R Diagrams

THEME Patterns Classify the types of stars on the H-R diagram
as white dwarfs, giants, supergiants, or main-sequence.

Star Statements

Analyze Correct each false statement so that it is true.

A Hertzsprung-Russell diagram is a graph of stars with
temperature on the x-axis and color on the y-axis.

The region of the H-R diagram that most stars fall within
is the giant sequence.

For most stars, their surface temperature decreases as
their luminosity increases.

Exit Ticket

Choose one of the following ways to
compare the life cycle of the sun with
that of a more massive star outside the
main sequence.

Write 2–3 paragraphs about each
star’s life, and then read it to the
class.

Use a pad of paper or sticky notes to
draw a flipbook illustrating how each
star changes during its life cycle.

What is the life cycle of a star?

What is the life cycle of a star? continued

A star is a giant ball of hot gas, mainly composed of hydrogen and
helium. A light-year is the distance that a star’s light travels in one year.

All stars have a life cycle in which they form, develop, and cease to shine
when they run out of fuel.

Classifying Stars - Presentation

Life Cycle of a
Star

•

A star’s life cycle is the
sequence of changes
that occur in a star as it
ages.

•

Even though we call it a
life cycle, stars are not
actually alive!

Are stars alive if they
have
a life cycle?

Your answer:

Classifying Stars - Presentation

Where Do Stars Come
From?
•

Stars are “born” from
interstellar mediums
which are areas of thinly
spread gas and dust.

•

The gas of these interstellar
mediums is mostly
hydrogen.

•

The dust is composed of
mostly carbon (C) and
silicon (Si).

What two elements
are most of the dust
in interstellar
mediums made of?

Your answer:

Classifying Stars - Presentation

Brain

Break

Classifying Stars - Presentation

Nebulas

•

When gravity attracts
the substances in
interstellar mediums,
they begin to collect into
big clouds called
nebulas.

•

Nebulas are the
birthplace of stars, as
stars are made up of gas
and dust.

•

Also known as a “star
nursery,” nebulas are
where young stars begin
to form.

Why would they call
nebulas star
nurseries?

Your answer:

Classifying Stars - Presentation

Protostar

•

Inside the nebula are regions
of greater and lesser gravity,
causing the gas and dust to pull
together.

•

As more atoms gather, their
gravitational attraction
increases.

•

This is where a protostar
forms. In this state, the star is
unstable, due to many reactions
occurring within the protostar.

Classifying Stars - Presentation

A Star Is Born!

•

When the core of a
protostar reaches
around 15 million
degrees Celsius,
nuclear fusion reactions
begin.

•

This reaction causes
hydrogen (H) to fuse
into helium (He) and
releases a tremendous
amount of light and
heat.

At what temperature
does nuclear fusion
begin?

Your answer:

Classifying Stars - Presentation

What evidence have you been
provided that could support why
the end of the protostar phase is
the point where a star is born?

Ask Questions and

Define Problems

Your answer:

Think

About It

Classifying Stars - Presentation

Main Sequence Stars

•

Once nuclear fusion begins
in a star, it reaches the
main sequence phase of
its life.

•

It is estimated that 90%
of all stars in the universe
are main sequence.

•

These stars radiate (shine)
energy into space in the
form of light and heat.

Classifying Stars - Presentation

•

Depending on the
amount of gas and
dust available from a
star's birth nebula, it
becomes either an
average or a massive
star during the main
sequence phase.

•

Smaller, average stars
have different life
paths than more
massive stars.

Different Paths

Classifying Stars - Presentation

Low Mass/Average Stars in the
Main Sequence
•

The mass of a star
determines what
happens to it after
living most of its life in
main sequence.

•

Low-mass starsin
the main sequence are
cooler and have a
reddish appearance.

What color are low-mass stars
in the main sequence?

Your answer:

Classifying Stars - Presentation

Red Giants

•

Red giantis the next phase
after main sequence stars.

•

Both low-mass and high-mass
main sequence stars can
progress to be red giants next.

•

The outer gas layers of the star
expand, and as the star uses all
its fuel, its core shrinks.

•

They are red in color and have
high luminosity.

Classifying Stars - Presentation

Planetary
Nebula
•

Planetary nebulas
occur at the end of a
low-mass red giant’s
life.

•

The outer layers of
the star are expelled
into space and
appear as brightly
colored clouds.

•

The leftover core is
extremely hot and
luminous and
becomes a white
dwarf star.

Classifying Stars - Presentation

White Dwarf(Burning OUT)

•

A white dwarf forms
when a low-mass star
runs out of fuel.

•

They become the core
of a planetary nebula.

•

They are incredibly
dense with
a gravity that is
350,000 times that of
gravity on Earth!

•

They will change
colors as they cool.
=Red dwarfs

Classifying Stars - Presentation

Black Dwarf

•

A black dwarfis the end
product of a white dwarf star.

•

They are the last stage of
stellar evolution for low-mass
stars.

•

A black dwarf no longer emits
heat or light and is no longer
considered a star.

Classifying Stars - Presentation

Match the phases of the life cycle of a low-mass star
to its image.

Quick Action:

INB

Classifying Stars - Presentation

Brain

Break

Classifying Stars - Presentation

High Mass/Average Stars in the
Main Sequence
•

The mass of a star
determines what
happens to it after
living most of its life
in main sequence.

•

High-mass starsin
the main sequence
are hotter and have a
blue or white
appearance.
What type of stars are hotter,
low-mass or high-mass stars?

Your answer:

Classifying Stars - Presentation

Red Supergiants and Blue

Giants

•

Red supergiantor blue
giantis the next phase
after main sequence star.

•

Both low-mass and
high-mass main sequence
stars can progress to be
red giants first.

•

In red supergiant and blue giant stars, the
outer gas layers of the star expand and, as
the star uses all its fuel, its core shrinks.

•

They are red or blue in color and have high
luminosity.

Classifying Stars - Presentation

Supernova

•

A supernova is the last
stage of a high-mass star’s
life.

•

Supernovas occur as the
star runs out of nuclear
fuel and some of its mass
flows into
its core.

•

Its core becomes so heavy
that it cannot withstand its
own gravitational force.

•

This causes the core to
collapse and results in a
giant explosion!

Classifying Stars - Presentation

•

A neutron star is the very dense core
left behind after a supernova.

•

1 teaspoon of a neutron star would have a
mass of over 1 billion tons!

•

Their gravity is 2 billion times that of
Earth’s gravity.

•

A neutron star’s gravity presses its material
in on itself so tightly that protons (+) and
electrons (-) combine to make neutrons,
yielding the name “neutron star.”

Neutron Star

Why do they call these stars
neutron stars?

Classifying Stars - Presentation

Black Hole

•

A black hole formswhen
very massive stars collapse
at the end of their life
cycle.

•

They are a large area in
space and have a very
strong gravitational pull.

•

Their gravity is so strong
that nothing can escape
them, not even light!

Classifying Stars - Presentation

Quick Action:

INB

Match the phases of the life cycle of a high-mass star to
its image.

Classifying Stars - Presentation

Patterns

Your answer:

Think

About It

birthplace

phase

formation

phase

stable
phase

expansion

phase

end

phase

100

Classifying Stars - Presentation

What color is the highest temperature on the H-R Diagram?

Your answer:

H-R Diagram

•

The Hertzsprung-Russel
Diagram, or H-R Diagram,
plots each star on a graph and
measures the star’s magnitude
(luminosity / brightness)
against its temperature
(color).

•

We use the H-R Diagram to
compare and classify stars!

101

Classifying Stars - Presentation

Temperature (K)

•

A star's temperature is
measured in Kelvin
(K).

•

The color of stars
depends
on their temperature.

•

The coolest stars are
red and the hottest
stars are blue.

102

Classifying Stars - Presentation

Luminosity

•

Luminosity is the amount
of energy (light) a star emits.

•

It is how bright a star is.

•

Luminosity is determined
by the size and temperature of
the star.

103

Classifying Stars - Presentation

Magnitude

Magnitude measures
a star’s brightness or
luminosity.

•

The lower the
magnitude, the more
luminous the
star is.MORE SHINY
BRIGHTEST

•

The higher the
magnitude, the less
luminous a star is.

•

LESS SHINY,
DIMMEST!

104

Classifying Stars - Presentation

Brain

Break

105

Classifying Stars - Presentation

•

Apparent magnitude (m)
is how bright an object
appears from Earth, or
where you are observing
from.

•

Absolute magnitude (M)
is the measure of a star’s
brightness as if it were at a
standard distance of
exactly 10 parsecs (32.6
light years) from
the observer.

Apparent vs. Absolute Magnitude

106

Classifying Stars - Presentation

Star
Magnitud

Temperat

ure

Type of

Star

- 8 M

white
dwarf

3,200 K

main

sequenc

1 M

Quick Action:

INB

Use the image and table below to classify stars using
the H-R Diagram.

107

Classifying Stars - Presentation

Low-Ma
ss
Life
Cycle

High-M
ass
Life
Cycle

main

sequen

red

giant

planeta

nebula

white
dwarf

nebul

main

sequen

red/blu
e giant

superno

neutro
n star

black
hole

Last

Look

108

Classifying Stars - Presentation

Check for Understanding

Can you describe the life cycle of
a star?

How do we use the H-R Diagram
to help
to compare and classify stars?

Your answer:

109

Classifying Stars - Presentation

Which part(s) of the Essential
Question(s) do you still need help to
understand?

Still Have Questions?

Your answer:

110

What is an H-R diagram?

111

112

What is an H-R diagram? continued

A star’s temperature is related to
its luminosity, the amount of
energy it emits from its surface.

The Hertzsprung-Russell
diagram, or H-R diagram, is a
graph that shows the temperature
and luminosity of different stars.

113

How can you use a Hertzsprung-Russell
diagram to compare and classify stars?

114

Use H-R Diagrams

THEME Patterns Classify the types of stars on the H-R diagram
as white dwarfs, giants, supergiants, or main-sequence.

115

Star Statements

Analyze Correct each false statement so that it is true.

A Hertzsprung-Russell diagram is a graph of stars with
temperature on the x-axis and color on the y-axis.

The region of the H-R diagram that most stars fall within
is the giant sequence.

For most stars, their surface temperature decreases as
their luminosity increases.

116

Exit Ticket

Choose one of the following ways to
compare the life cycle of the sun with
that of a more massive star outside the
main sequence.

Write 2–3 paragraphs about each
star’s life, and then read it to the
class.

Use a pad of paper or sticky notes to
draw a flipbook illustrating how each
star changes during its life cycle.

TEKS 8.9A, 8.2B

Stars

KEY IDEAS

• What is the life cycle of a star?
• What is a Hertzsprung-Russell diagram?
• How can you use a Hertzsprung-Russell

diagram to compare and classify stars?

Words to Know

star

light-year

luminosity

Hertzsprung-Russell diagram

Show answer

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