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Life Cycle of Stars!
By; Rachel
How stars are formed. 1;

All stars form from cloud of gas (nebulae).

Stars that have more mass than 6 solar
masses are expected to supernova!

Stars that have less mass than that turn
into white dwarfs.
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html


A nebula is and
interstellar cloud of
dust.
The Eagle Nebula!
Nebula was
originally a general
name referring to
any extended
astronomical object
http://en.wikipedia.org/wiki/Nebula
clounaghscience.wordpress.com/
Supernova
A supernova!
A supernova is when
a very big star
EXPLODES. This
happens when a star
runs completely out of
energy to produce
heat and light.
The biggest
supernovas are
hyper giants. The
smallest supernovas
are supergiants.
http://simple.wikipedia.org/wiki/Supernova
www.lawlibrary.co.za/.../2007/issue_16.htm
White Dwarf

A white dwarf is a
star formed mostly
of electrondegenerate matter.

A white dwarfs
mass is comparable
to that of our sun’s.
http://en.wikipedia.org/wiki/White_dwarf
How stars are formed. 2;

Following a supernova, if the remaining
part has a mass more than 3 solar
massed, it turns into a black hole.

When they are burning hydrogen into
helium, stars are their smallest. This
occurs during the majority of their life.
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html
A black hole!
Black Hole
 A black hole is a
figure in the universe
that has such a
mighty pull of gravity
that even light can’t
get away.
wopat.uchicago.edu/
 Many astronomers
didn’t know of its
existence until
recently.
http://simple.wikipedia.org/wikli/Black_hole
Hydrogen Fusion

Hydrogen fusion is a
cycle where four
hydrogen nuclei form
together to make a
helium nucleus.

Electrons, protons,
and neutrons are
involved in the course
of hydrogen turning
into helium.
http://www.windows.ucar.edu/tour/link=/sun/Solar_interior/Nuclear_Reaction
s/Fusion/Fusion_in_stars/H_fusion.html
Helium Fusion
science.howstuffworks.com/energy-form-space.htm
Helium
fusion is a
kind of
nuclear
fusion.
http://en.wikipedia.org/wiki/helium_fusion
How stars are formed. 3;

While stars are burning hydrogen into
helium, they are sometimes called
“dwarfs.”

There are white dwarfs, and brown
dwarfs.
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970422f.html
Brown Dwarf
 Brown Dwarf is an expression for an
object in space
that is bigger and different
than planets,
but its not a
true star.
http://simple.wikipedia.org/wiki/Brown_dwarf
news.nationalgeographic.com/news/2006/03/0323_0603
23_brown_dwarf.html
Why low-mass and high-mass
stars take different paths.

Low-mass stars and high-mass stars take
different paths at the end of their lives
because high-mass stars become so
compact that they have to do something
different than low-mass stars.
http://wiki.answers.com/Q/Why_low-mass_high-mass_stars_take_different_paths_at_the_end_of_their_life
other
VOCABULARY FOR STARS!
Protostar
 A protostar is a large
object that forms by
decrease out of gas a
giant molecular cloud in
the interstellar medium.
 The protostellar phase is
an early stage in star
formation
http://en.wikipedia.org/wiki/Protostar
Main Sequence Star

A main sequence
star is a continuous
and extraordinary
chain of stars that
appear on the plots
of stellar color
versus brightness.
http://en.wikipedia.org/wiki/Main_sequence_star
Red Giant



A red giant is a very big
star that weighs about
one half to ten times as
much as our sun.
They are called red
giants because they look
red and are very big.
Many red giants could
fit thousands and
thousands of suns, like
the one in our solar
system, inside them!
http://simple.wikipedia.org/wiki/Red_giant
www.skyofplenty.com/?page_id=374
Planetary Nebula

A planetary nebula is a
nebula made up of gas
and plasma.

Planetary nebulae are
called this because if you
look at them through
optical telescopes, they
look like planets.

They are made of
particular stars when they
die.
http://simple.wikipedia.org.wiki/Planetary_nebula
A planetary nebula!
Commons.wikimedia.org/wiki/File:Planetary.Nebula.Formation.png
Neutron Star
 Neutron stars are very
small and dense stars
that hare made almost
entirely out of neutrons.
 A neutron star is a
large nucleus held
together by gravity.
 A neutron star’s radius
is about 10 kilometers
and its mass is about
1.4 to 5 times the sun’s
mass.
http://simple.wikipedia.org/wiki/Neutron_star
Commons.wikimedia.org/wiki/File:Neutron_star_cross_section.jpeg
Supergiant

A supergiant is a larger
star than our sun.

It has a short life span of
10-50 million years
because or its large mass

They can be red (which
are cold) or blue (which
are hot).
http://www.faq.com/qa/qa_10705.html
Red supergiant!
cse.ssl.berkeley.edu/…/cycle/supergiant.html
 Black dwarf is Black
when a white dwarf
becomes too cool to
create large
amounts of heat and
light.
 Although, black
dwarfs are not
proved to exist
because it takes a
white dwarf longer
than the current age
of the universe to
turn into one.
http://simple.wikipedia.org/wiki/Black_hole
Dwarf