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Slide 1

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The life cycle of a
Our sun is just one of many billions
of stars in the universe.
Astronomers have studied these
stars and discovered that each star
has a life cycle that takes billions of
years to complete.…read more

Slide 2

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The Universe...
The universe is everything, all time space
and matter It is thought that the galaxies
are moving away ( The red shift ) at very FACT: Our galaxy is
high speeds. The universe is EXPANDING the milky way and it
so does that mean that the universe used is a spiral. It take a
to be one big bundle and was blown apart total of 200 million
by the big bang and haven't stopped years to turn.
moving away since?…read more

Slide 3

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The Stellar Nebula
The Nebula ( clouds of dust and gas )
rotates and collapses in on itself (
gravitational collapse). As the cloud
travels faster and smaller in on itself
it gets hotter and the fusion of
hydrogen occurs, This is the first Above: The stellar Nebula, a
cloud of dust and gas (
stage of a star.
hydrogen )
A Proto-star is born..…read more

Slide 4

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The proto-star
The gravitational pull of the
proto-star is converted into heat
energy and the temperature rises.
The cloud and gas start to glow. A
long time later it reaches a high
temperature . Nuclear reactions
start to occur as the hydrogen
fuses and becomes helium. The late stages of a proto-star.…read more

Slide 5

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The main sequence star
The largest part of a stars life is spent as a main sequence
star during which hydrogen is being converted into helium.
This is a stable period.
The heat radiation
pushes outwards
and the same
amount of force is
pushed in by
gravity, This creates
a stable star.
The main sequence
star lasts for billions
of years.…read more

Slide 6

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Eventually all the hydrogen is used up,
helium fusion now takes place. The
radiation pressure increases which
expands the outer parts of the star to form
a red giant. Stars 5 to 25 times larger than
our sun expand to form the super giant.
The large red giant.…read more

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