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What are they and where did they
come from?
· A nebula is a cloud of gas and dust in
· Some nebulas are regions where new
stars are being formed, while others
are the remains of dead or dying
· Nebulas come in many different
shapes and sizes. There are four
main types of nebulas: Planetary
nebula's, reflection nebula's,
emission nebulas and absorption
· The work nebula comes from the
Latin word for cloud.…read more

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What is a Protostar?
· Stars are born is clouds of gas and dust, mostly
Hydrogen. More and more gas is pulled together
by gravity to form clouds.
· After some time gas clouds begin to spin this makes
the hydrogen atoms collide with one another
with much energy this makes heat. The clouds
become hotter with the nuclear reactions happening within.
· This hot cloud is called a protostar.
· The protostar continues to contract up and is still forming to become a star.
· The protostar phase can last for around 100,000 years after which time it will
be a official star.…read more

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Main-Sequence Stars
· During this stage of the stars lifecycle it is using
nuclear fusion to fuse hydrogen atoms to create
the larger helium.
· The stars that are in main sequence are the most
stable and are there for in this stage for the longest.
· This happens because of the Hydrostatic
Equilibrium, this is when the inward gravity of
the Suns pressure is equal to the
radiating pressure and energy created by
the fusion happening within.
· The smaller the star the longer it remains in this period,
many would think that the bigger stars have more hydrogen
to fuse, however these bigger stars have more gravitational
pull therefore the rate of fusion is much quick. When the
hydrogen runs out it becomes a Red Giant/Super Red Giant.…read more

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Giant Star (super giants)
· A giant star with a mass like our sun that is
in the last phase of its life
Hydrogen fusion reactions have
become less efficient in the core region,
and with gravitational pull the core begins
to collapse, fusion reactions now occur in the
shell surrounding the core.
· The outer layers then cool to only 3000k or so and
you get a red star, but its size is equal to the
orbit of mercury, Venus or even earth.…read more

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Super Giants
What's the difference?
· Even larger `super Giants' can
outshine the sun by over a million
· These are very big stars
seen just before their
supernova stages.…read more

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