Download A Story about a Star`s Life

Twinkle, Twinkle Little Star…
How I wonder what you are…
• Stars have
• Different colors
• Which indicate different
temperatures
• The hotter a star is, the faster it
burns its life away.
The Magnitude Scale
• About 150 B.C., the Greek astronomer
Hipparchus measured apparent
brightness of stars using units called
magnitudes
• Brightest stars had magnitude 1 and dimmest
had magnitude 6
• The system is still used today and units of
measurement are called apparent magnitudes
to emphasize how bright a star looks to an
observer
• A star’s apparent magnitude depends on
the star’s luminosity and distance – a star
may appear dim because it is very far
away or it does not emit much energy
Stars Start From Clouds
• Clouds provide the gas
and dust from which
stars form.
Stellar Nursery
Gravity pulls the
dust and gas
together to form
protostars.
Protostars
←Protostars start in
nebulas.
Sun-like Stars
Massive Stars
A Star is Formed
As the mass falls together it gets
hot. A star is formed when it is hot
enough for the hydrogen nuclei to
Massive Stars
Sun-likefuse
Stars together to make
helium This
is nuclear fusion
A Main Sequence star
It immediately enters a long
stable period where the outward
pressure created by nuclear
Massive Stars
Sun-like Stars
fusion balances
the force of
gravity
Death Cycle
The mass of the star determines
it’s fate.
Sun-like Stars
Massive Stars
Death Cycle
←If the mass of the
star is less than 8
solar masses, it
follows the cycle to
the left.
Sun-like Stars
Massive Stars
Death Cycle
←When all the Hydrogen is
converted to Helium the
forces become unbalanced
and a RED GIANT is
formed.
Sun-like Stars
Massive Stars
Death Cycle
←When all the
Helium is converted
to Carbon, a
PLANETARY
NEBULA is formed.
Sun-like Stars
Massive Stars
Death Cycle
←The remaining hot
Carbon core is called
a WHITE DWARF.
Sun-like Stars
Massive Stars
Death Cycle
← After cooling, it is
called a BLACK
DWARF.
Sun-like Stars
Massive Stars
Death Cycle
If the mass of the
star is greater than
8 solar masses, it
follows the cycle to
the right.
Sun-like Stars
→
Massive Stars
Death Cycle
As the nuclear fuel is
consumed, a SUPER
RED GIANT is
formed.
Sun-like Stars
→
Massive Stars
Death Cycle
Once fusion stops, a
SUPERNOVA
occurs.
Sun-like Stars
→
Massive Stars
Death Cycle
If the left over core
is less than 1.4 solar
masses, a
NEUTRON STAR is
formed.
Sun-like Stars
→
Massive Stars
Death Cycle
If the leftover core,
is greater than 1.4
solar masses, a
BLACK HOLE
forms.
→
Massive Stars
Matter leftover from the explosion
of dying stars returns to the
universe and can be recycled into
new stars.
Life Cycle of a Star Rubric
1. Go to the websites listed on the back of this paper to get more information on a star’s
life cycle.
2. Your assignment is to use the 10 cards you have been given to illustrate the life
cycles of sun-like stars, huge stars, and giant stars.
3. You will need a card for each of the following: nebula(stellar nursery), protostar, red
giant, planetary nebula, white dwarf, black dwarf, red supergiant, supernova,
neutron star, and black hole
4. You will have one card for each stage of the star’s life.
5. On the front of each card you need to draw and color the star. You must also label
the stage of the star.
6. On the back you need to include 3-5 pieces of information about that stage from your
research.
7. During the following period you will exchange cards with a partner and be asked to
diagram, with the cards, the specific life cycle you have been assigned. You will
have to demonstrate the life cycle of sun-like stars, huge stars, or giant stars.
Grading:
10 colored pictures………………………………………………..20pts
Having all pictures labeled.………………………………………10pts
3-5 pieces of information per card………………………………..30pts
Correctly arranging cards in the life cycle……………………….15pts
For Your Information:
http://www.telescope.org/pparc/res8.html
www.enchantedlearning.com/subjects/astronomy/stars/lifecycle/
http://webs.wichita.edu/lapo/lss.html
http://map.gsfc.nasa.gov/m_uni/uni_101stars.html
http://curious.astro.cornell.edu/question.php?number=38
http://imagine.gsfc.nasa.gov/docs/teachers/lifecycles/LC_main_p1.html
http://curious.astro.cornell.edu/the-universe/stars-and-star-clusters
http://amazing-space.stsci.edu/resources/explorations/light/
http://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/
http://aspire.cosmic-ray.org/Labs/ShootTheStars/
http://www.windows2universe.org/sun/Solar_interior/Nuclear_Reactions/Fusion/Fusion_in_stars/star_life.html
http://www.jb.man.ac.uk/distance/life/sample/stars/