12.1 notes stars. what are stars? a star is a large ball of gas that emits energy mostly composed of...
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12.1 NotesStars
What are Stars?
• A Star is a large ball of gas that emits energy• Mostly composed of hydrogen and helium.• Energy starts at the core.
Sketch this picture on the left page and label the Core and the Photosphere (surface)
Left
What are the Star Types?From Smallest to Largest
What are the Star Types?From Smallest to Largest
Neutron Stars {so small that they aren’t even included in
this picture!}
What are the Star Types?From Smallest to Largest
White Dwarfs
What are the Star Types?From Smallest to Largest
Main Sequence
White Dwarfs
What are the Star Types?From Smallest to Largest
Red Giants
Main Sequence
White Dwarfs
What are the Star Types?From Smallest to Largest
Supergiants
Red Giants
Main Sequence
White Dwarfs
Why are Stars Different Colors?
Color indicates surface temperatureAs temperature goes up, wavelength goes down.The hottest stars are blue because they have the
shortest ______________.
Why are Stars Different Colors?
Colors from coolest to hottest:Red, Yellow, White, Blue
Why Do Some Stars Look Brighter Than Others?
The closer a star is, the brighter it looks.
New Vocabulary:
Light-years: used to measure the distance between stars
Luminosity: how bright something is
New Vocabulary
Spectroscope: a tool to study the light from stars. It is able to determine what elements are present in the stars.
Continuous Spectra: [Rainbow] Caused by light from a star traveling through a prism.
New VocabularyAbsorption Spectra: [Rainbow with dark lines]Caused by light from a star traveling through a
cooler, less dense gas before traveling through a prism.
Mnemonic # 1
• Make a mnemonic for remembering star types from smallest to largest.
Neutron starWhite dwarfMain sequenceRed giantSupergiant
Left
Mnemonic # 2
• Make a mnemonic for remembering star colors from coolest to hottest
RedYellowWhiteBlue
Left
Take out your Standards Review Worksheets
Do #s 15, 16, and 17
ET 9/24
Name: _________ Period: ____ Group:___
List the star types in order from smallest to largest
What are stars?A Star is a large ball of ______ that emits ____________! Mostly composed of ______________ and _____________Energy starts at the ___________.
What are the Star Types? (from smallest to largest):
___________________________________________________
___________________________________________________
Why are stars different colors?Color indicates _____________________________________
As temperature goes ______, wavelength goes _______.
The hottest stars are _________ because it has the shortest _________________.
Colors from coolest to hottest:___________________________________________________
Why do some stars look brighter than others?The closer a star is, the ________________ it looks.
New Vocabulary:_________________: used to measure distances between stars
_________________: how bright something is
______________________: a tool to study the light from stars. It is able to determine what elements are present in the stars.
_____________________________: [Rainbow]Caused by light from a star traveling through a prism.____________________________: [Rainbow with dark lines]Caused by light from a star traveling through a cooler, less dense gas
before traveling through a prism.
What are stars?A Star is a large ball of ______ that emits ____________! Mostly composed of ______________ and _____________Energy starts at the ___________.
What are the Star Types? (from smallest to largest):
___________________________________________________
___________________________________________________
Why are stars different colors?Color indicates _____________________________________
As temperature goes ______, wavelength goes _______.
The hottest stars are _________ because it has the shortest _________________.
Colors from coolest to hottest:___________________________________________________
Why do some stars look brighter than others?The closer a star is, the ________________ it looks.
New Vocabulary:_________________: used to measure distances between stars
_________________: how bright something is
______________________: a tool to study the light from stars. It is able to determine what elements are present in the stars.
_____________________________: [Rainbow]Caused by light from a star traveling through a prism.____________________________: [Rainbow with dark lines]Caused by light from a star traveling through a cooler, less dense gas
before traveling through a prism.
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