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The Life of A Star

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on 4 October 2014

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Transcript of The Life of A Star

The Life of A Star
By : Grace Yu
Intro
Review
Life of
Average Mass Stars
Bibliography
Thanks for Watching!
The life cycle of a star depends on the type of star it is. There are
Average Mass Stars
&
Massive Stars
Massive Stars are bigger than Average Mass Stars, the same way some people are a bit bigger than others, even though they
are the same age.
Average Mass Star
When some
Protostars
(baby stars) grow up, they become
Average Mass Stars
! The Average Mass Star we know best is
the Sun
!
Do you remember what they eat to get energy?
Hydrogen!
Red Giant
After
Average Mass Stars
eat all of their hydrogen, they get bigger and bigger and
start eating
helium
, which gets stored as
carbon
, because they're so big. They also become red, so we call them
Red Giants
! Look at how big they are compared to the Sun!
Figure 5: Red giant vs Sun
http://spaceinfo.com.au/wp-content/uploads/2011/03/sun_redgiant_300.jpg
Planetary Nebula
After the
Red Giant
eats all of its
helium
, it becomes a
Planetary Nebula
. Planetary Nebulas are so big that they aren't the shape of a ball anymore- they start looking like pretty flowers in space!
Figure 6: Planetary Nebula
http://www.cosmiclight.com/galleries/images/catseye-ngc6543.jpg
White Dwarfs
After the star becomes a
Planetary Nebula
, it cools down and becomes smaller and white- so it's called a
White Dwarf
!
Figure 7: White Dwarf Star
http://www.centauri-dreams.org/wp-content/uploads/2012/08/whitedwarf.jpg
Life of Massive Stars
Massive Stars
Massive Stars
are more than
5 times
the size of the Sun! They are also hotter and look
blue
or
white
.
Star Energy
Average Mass Stars
get energy from
hydrogen
- which is like a type of food- to make them twinkle. It gets stored in them as
helium
- like when food goes in our stomachs.
Massive Stars
are bigger, so they "eat" hydrogen faster and when they run out, they start eating other food, or

elements
.
Star Birth
All stars are born the same way, whether they are big or small- like us!
Nebula
A star begins as a
nebula
, which is a cloud of gas and dust.

Figure 1: Nebula
http://upload.wikimedia.org/wikipedia/commons/d/d6/Hs-2009-25-e-full_jpg.jpg
The dust and gas in the nebula start coming together because of gravity- which pulls everything together.
Figure 2: Condensed Nebula
http://upload.wikimedia.org/wikipedia/commons/0/00/Crab_Nebula.jpg
The nebula cloud gets smaller and smaller and it starts spinning around. As the dust gets closer to each other, the nebula also gets hotter!
Figure 3: Spinning Nebula
http://cdn0.cosmosmagazine.com/wp-content/uploads/20080604_crab_nebula.jpg
Protostar
When the nebula gets really hot- 10 million degrees Celsius, it becomes a
protostar
- a baby star! Now, it starts giving off heat and light, and twinkling!
Figure 4: Protostar
http://upload.wikimedia.org/wikipedia/commons/9/91/LRLL_54361aa.jpg
Figure 8: Massive Star
http://www.gethow.org/wp-content/uploads/2013/04/massive-stars.jpg
Red Supergiant
The same way Average Mass Stars get
bigger and turn red after they eat all of their hydrogen,
Massive Stars
do too, except since they're bigger, they don't become Red Giants, they become
Red

Supergiants
!
Red Supergiants
don't just eat
hydrogen
-they eat
helium
,
carbon
, and
silicon
, too. Their stomachs are filled with
iron
because of the silicon they eat. They look like
onions
because the heavier elements are in the middle and the lighter ones are on the outside!
Figure 9: Red Supergiant
http://static.memrise.com/uploads/things/images/16992184_130616_2041_43.png
Figure 10: Red Supergiant Layers
http://astrobob.areavoices.com/astrobob/images/Evolved_star_fusion_shells__SMALL.jpg
Supernova
After
Red Supergiants
eat all of their silicon, they put on a spectacular show- called a
Supernova
! They become super hot and produce lots of energy that blows away their outside layers.
Figure 11: Supernova
http://www.mpa-garching.mpg.de/mpa/institute/news_archives/news1005_janka/fig3.jpg
Neutron Star
OR
After a
Supernova
, a
Massive Star

can become a
Neutron Star
, which is a tiny star that is really, really heavy. If it spins around quickly, it becomes like a strong magnet and produces electricity!
Figure 12: Neutron Star
http://img3.wikia.nocookie.net/__cb20130625160751/memoryalpha/en/images/2/2c/Neutron_star.jpg
Black Hole
If the
Massive Star
is really, really big-
15 times
the size of the Sun or more, it will become a
Black Hole
. They are very strong and mysterious because we can't see them- they're completely black- but we can see them using
X-ray vision
!
Figure 13: Black Hole
http://abyss.uoregon.edu/~js/images/black_hole_image.jpg
Do you remember the life cycle of the different stars? Here's a review:
Figure 14: Life Cycles of Stars
http://www.schoolsobservatory.org.uk/sites/default/files/astro/starcycle.jpg
The Life Cycle of Stars
Did you know that the same way we grow up, stars grow up, too? Today you will learn about how different stars grow up, which is called the
Life Cycle of a Star
!
Full transcript