Star Lifecycle

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Stars

Lesson 1 of 2

​Essential Question(s):

​

• How does our sun compare to other stars in the universe?

• How do stars change over time?

• How are stars classified on a Herztsprung-Russell Diagram?

​Watch the Video...

Think about what is RED SHIFT?

Open Ended

According to the video:

What is a “red shift”?

​All stars begin in a cloud of gas

and dust called a

stellar nebula. ​

Gravity will cause the nebula to

contract.

The nebula will break into smaller

pieces. These pieces will

eventually form stars.

​

Life Cycle of a Star​

​Watch the Video...

WHAT is the Life Cycle of our STAR?

Is an average sized star...

• Its born in a NEBULA

• It will stay in this main sequence phase for a long time.

• When it starts to die it grows into a RED GIANT

• Then it will go planetary nebula

• Then die as a white dwarf​

Our Sun

Multiple Choice

What are stars made of?

• helium

• oxygen

• Hydrogen and helium

• heat

Multiple Choice

Is the sun a stars?

• Yes

• No

Multiple Choice

A star that burns its nuclear fuel steadily over time is known as...

• a stable star

• a main sequence star

• a primary star

• a supernova

Multiple Choice

If a star becomes a red giant after about 1 million years as a main sequence star, is the star small or large?

• small

• large

Multiple Choice

The red giant phase of a star's lifecycle begins when...

• the star's fuel begins to run out

• the star blows out its atmosphere

• a planetary nebula condenses into a protostar

Multiple Choice

After an average star has exhausted its fuel, the star becomes a(n)

• neutron star

• supernova

• white dwarf

• planetary nebula

Vocabulary

Luminosity

Brightness

In an HR Diagram brightness Increases from bottom to top

​

Temperature

In an HR Diagram​ temperature increases to the RIGHT

Multiple Choice

As a whole, Giants are considered hotter than White Dwarfs.

• True
• False

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 star is the coldest?

• Yellow Star
• Red Star
• Orange Star
• Blue Star

Multiple Choice

Compared to the rest of the stars, our sun is considered...

• Extremely Large and Cold
• Small with a medium temperature
• Medium size with medium temperature

Multiple Choice

Which category is our Sun located in?

• White Dwarfs
• Supergiants
• Main Sequence
• Giants

Multiple Choice

The category that contains the most stars is...

• Main Sequence
• Supergiants
• Giants

Multiple Choice

What characteristics are used to classify stars?

• Flammability, weight, and reactivity

• Temperature/color and brightness

• Conductivity, luster, and density

• Malleability, distance, and viscoscity

Multiple Choice

Knowing the color of a star also tells us its __________

• age

• location

• temperature

• name

Multiple Choice

As you move from the bottom to the top of the H R diagram the __________ changes.

• Temperature
• Luminosity or Brightness