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Star Classification
Good Morning! Bell Work
 What are some ways that we could group these stars? How do
you think scientists group stars? Answer on scrap paper!
We Classify Based on
Characteristics
 Stars are huge balls of glowing gas
that produce energy through
fusion.
 Stars looks so small because they
are so far away.
 Only a few thousand stars can be
seen without a telescope.
 Light Year – the distance that light
travels in one year.
 Equivalent to 9.5 trillion kilometers.
 Sun is our closest star, and the next
closest is 4 light years away.
Brightness and Distance
 Some stars are brighter than others.
 The distance between the star and Earth, and the amount of
light a star gives off determines the star’s brightness.
 Stars close to Earth can appear bright, even if they do not
give off much light. Additionally, very bright stars may
appear faint if they are far away.
 Parallax – the apparent shift in position of an object when
viewed from different locations.
 This is how we determine a star’s distance from us.
Size
 The diameter of the Sun is about
100 times larger than the diameter
of the Earth.
 Stars can be bigger than the Sun!
 Giant and Supergiant stars are larger.
 Betelgeuse is 600 times greater in
diameter than the Sun.
 Stars can be smaller than the sun!
 White dwarfs are smaller than the
Sun.
 About 100 times smaller than the
Sun’s diameter.
 Size of Earth
Color and Temperature
 Stars vary in color. These differences are because of the
difference in temperature
 Most look white, some are blue, some are red.
 We group stars by color.
 Blue  White Yellow  Orange  Red
 As you go across, the stars get cooler.
Schedule
Bell Work
5-10 Minutes
Star Classification Lab
20 Minutes
Star Notes
15 Minutes
ABCD Review / Analysis
Questions
10 – 15 Minutes
Exit Ticket
5 Minutes
Based off of this data, what is the
best way to classify these stars?
 A. Color
 B. Temperature
 C. Brightness
 D. Size
Star #
Known Information
45
6,000 degrees Celsius
78
7,000 degrees Celsius
239
10,000 degrees Celsius
789
8,000 degrees Celsius
7855
1,000 degrees Celsius
391
7,000 degrees Celsius
Based off of this data, what is the
best way to classify these stars?
 A. Color
 B. Temperature
 C. Brightness
 D. Size
Based off of this data, what is the
best way to classify these stars?
 A. Color
 B. Temperature
 C. Brightness
 D. Size
Schedule
Bell Work
5-10 Minutes
Star Classification Lab
20 Minutes
Star Notes
15 Minutes
ABCD Review / Analysis
Questions
10 – 15 Minutes
Exit Ticket
5 Minutes
Remember : Quiz Tomorrow!!