Download 8.3 Stars

Warm Up
 What causes day and night?
 Why do we experience season’s?
 What divides the Earth into northern and
southern hemispheres?
 What is a revolution?
 If the northern hemisphere is experiencing spring,
what is the southern hemisphere experiencing?
 Explain the difference between nutation and
precession.
1.
2.
3.
4.
5.
Activating stratgegy
1) How many Earths do you think
would fit inside the Sun?
2) How hot do you think the Sun is?
3) How much longer do you think the
Sun will last?
4) How many stars do you think there
are in our Milky Way?
5) How many stars do you think there
are in the whole universe?
Quote of the Day
Life is not about waiting for the storm to
subside. It’s about learning to dance in
the rain!
Objective & LEQ
Objective: SWBAT analyze the
life cycle of stars and apply it to
the Hertzsprung-Russell diagram.
LEQ: What determines the life
cycle of a star and how is it
applied to the HertzsprungRussell diagram?
Table of Contents
Left Side Item
Page
Right Side Items
Page
T-Chart Planets
0
Solar System
Formation CN
1
Kepler 22b Article
0
Planetary Motion CN
3
Universe Venn
Diagram
0
Star CN
5
Season’s Foldable
2
Season’s Graphic
Organizer
2
HR Diagram
4
Star Foldable
4
Science GEMS of Wisdom
Page
Avid Strategy
0
T-Chart Planets
0
Kepler 22b Article
0
Universe Venn
Diagram
2
Season’s Foldable
2
Season’s Graphic
Organizer
4
HR Diagram
4
Star Foldable
W
I
C
O
R
Warm Up ANSWERS
 1. 1 million (1,000,000!) Earths!
 2. 10,000°million F!
 3. About 7 billion more years
 4. 200-400 billion
 5. 100,000,000,000,000,000,000,000!
Quiz!
 You may use your notes
 ABSOLUTELY NO TALKING
 First time, verbal warning and -5 points
 Second time, zero on your quiz
 Once you are finished, hold up your quiz and I
will collect it.
 You have 3 things to finish:
 Make sure you have a SUMMARY written for your
notes yesterday (**remember, the summary
answers the LEQ)!
 Finish chunking/coloring notes
 Finish the worksheet and foldable (it was HW)
*Stages of a Star
A-Large star
B-Crab Nebula
C-Orion Nebula
F-Nova Cygni
D-Betelgeuse
E-Supernova
G-Supernova
H-Embryonic Star
Black Hole Video Clip
 http://www.youtube.com/watch?v=h1iJXOUMJ
pg
 Scientist Neil Degrasse Tyson
 *What are the different ways that death would
result from a black hole?
Characteristics of Stars
 Apparent magnitude: (a stars brightness as it appears from
EARTH)
 1. how big it is
 2. how hot it is
 3. how far away it is
 Absolute magnitude: how bright a star actually is.
 (ex: 2 stars with equal absolute magnitudes may have
difference apparent magnitudes because one is farther
away!)
 Luminosity measures absolute magnitude.
 Surface temperature: how hot a star is (measured in Kelvins)
Characteristics of Stars
 HR Diagram:
A graph that shows the relationship
between the absolute magnitude and
temperature of stars.
 The hottest main sequence stars are the
brightest
 The coolest main sequence stars are the
dimmest.
Use the information on luminosity
and apparent magnitude to
make a Hertzsprung-Russell
diagram (pg. 704)!
Draw your own HR Diagram
using the chart on page 704 as
an example!!
 You have 20 minutes…work smart!
Hertzsprung-Russell diagrams
Stars go through life cycles, just
like people.
What determines the life cycle of a star?
Depending on how big a star is,
it will follow a certain life path.
FAST FACT
 In a few billion years, the sun’s core will run out of
hydrogen fuel, triggering nuclear fusion in the
surrounding shell. As a result, the sun’s outer
envelope will expand, producing a red giant
hundreds of times larger and brighter. Intense
solar radiation will boil Earth’s oceans, and solar
winds will drive away Earth’s atmosphere.
Directions
 Complete the star foldable and lifecycle
diagram using pages 707-711 in your
textbook for:
 A) low-mass stars
 B) medium-mass stars (sun-like)
 C) massive stars
 *Draw the life cycle stages for the 3 types of
stars
 This will be glued/taped onto page 6 of your
notebook!
 http://www.youtube.com/watch?v=YU6X3SPZ
AJo
Star Nursery (nebula)
 The birthplace of a star where gas and dust begin to
combine to form the star
Protostar
 the beginning stages of star formation when gravity pulls
in the gas and dusts from the star nursery and it begins to
shine!
Main Sequence Star
90% of all stars in the universe; when stars radiate
(shine) energy into space
Red Giants
 a large bright star with a cool surface. It is formed during
the later stages of the evolution of a star like the Sun, as
it runs out of hydrogen fuel at its center
White Dwarf
Thought to be the final evolutionary state of all stars whose mass
is not too high—over 97% of the stars in our Galaxy; when its
nuclear energy is gone, I begin to contract and appear very
bright
Black Dwarf
Over a very long time, a white dwarf will cool to temperatures
at which it is no longer visible and become a cold black
dwarf; become a lump of coal in the sky when all its nuclear
energy is gone
Supernova
 type of death for Massive and Giant Blue Stars. They are a
stellar explosion of its content material with a burst of radiation
that are very luminous
Blackhole
a region of space in which the gravitational field is so
powerful that nothing, including light, can escape its pull. The
black hole has a one-way surface, called an event horizon,
into which objects can fall, but out of which nothing can
come (form of death for massive stars)
Neutron star
also known as a Pulsar star because of its ‘pulsating’ effect
that can be seen when viewed at a specific angle. The
Pulsar Star is a result of the gravitational collapse of a Giant
Blue Star
Stellar Match!
 Cut out the star stages and definitions
 Match the start stage with the correct
definition
 Glue it into your notebook on page 6
 Using pages 704-714, match the type of
star with its description.
 You have 10 minutes to complete this
activity.
Star Story:
 Write a short story following a star from birth to death.
 Beginning
 At least 3 descriptive sentences about each stage.
 End
 OR
 Illustrate a comic book following a star from birth to
death. Must have drawings AND text (speech/thought
bubbles).
 Beginning
 At least 3 panels for each life stage.
 End
Textbook Activities
 Read pages 703 – 704 and 706. Answer questions
4 – 5 on page 706.
 Read pages 707 – 714. Answer questions 1-4 on
page 714.
 Read pages 622 – 624: Answer questions 1 and 2
on page 629.
 Read pages 644 – 647: Answer questions 1-6 on
page 648.
Exit Ticket
 1. What is the difference between
apparent magnitude and absolute
magnitude?
 2. What two characteristics of stars does a
H-R diagram show?
 3. Draw out the 7 consecutive stages of a
sun-like star (medium-mass).
 4. What type of star ends as a neutron star
or black hole?