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Transcript
The Lives of Stars.
By: Brett Mele,
Tyler Knight,
Philip Gonyea
Dependra
How is a star “born”?
 All star start their lives as a dense part of
a nebula. (A big cloud of gas and dust
spread out in space.) in the dense part of
the nebula the gas and dust becomes so
dense and hot that a star is born.
Nebulas
 This is a nebulae. All stars form out of
this. They start a protostars, then form
into a star from nuclear fusion. Here are
some pictures.
 As you can see this nebula has stars
forming around it.
What happens to a star
when it runs out of fuel?
 When a star begins to run out of fuel its
core shrinks and the outer portion of the
star expands. Depending on the stars
mass the star either becomes a red giant
or a super giant. Red giants, and super
giants evolve in many different ways.
After a star completely runs out of fuel it
becomes either a white dwarf, a neutron
star, or a black hawk.
 This is a picture of a white dwarf.
 This is a picture of a red giant.
 This is a photo of a star going nova.
 Here we have a picture of a star going
supernova.
 This is a picture of a globular cluster.
What determines how long
a star will live?
 The mass of a star will tell you how long it will
live. You may think that if a star is bigger it lasts
longer. But you are wrong. Its kind of like a car
the smaller it is the longer it lasts. If the star is
very small it will live for about 200billion years.
If it is a medium size (like the sun) it will only
last about 10 billion years. Scientists
approximate the sun’s age to be about 4.6
billion years old. So it is almost half way
through its life. And large stars only live for
about 10 million years.
Star sizes
 These are some of the sizes of stars.
This is a large star.
 Now here is a quick video showing you
the life of a star.