Slides in this set
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
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
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.
A Proto-star is born..…read more
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
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
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
The RED GIANT
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