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Nebulae
Gravity makes the particles pull together. As they do this gravitational energy
is converted into heat energy and the temperature rises. This is now a proto-
star. When the temperature gets high enough, hydrogen nuclei undergo
nuclear fusion to form helium nuclei. This gives out massive amounts of heat
and light energy. By the way the word nebula is a derivitive from the latin
word meaning cloud.
Key terms
· planetary nebula­ when a star moves to white dwarf, it blows off its outer
layers
· supernova is where a star explosion produces some sort of plasma (not
enitrely sure). Outshines other galaxies. Our sun is too small to do this.
· nova is where hydrogen is petruding onto the surface of a white dwarf.
· Proto-star: A young star that hasn't yet started nuclear fusion in its core
Key facts
After the first 100 seconds of the universe quarks formed protons and electrons
and neutrons, which in turn made hydrogen and helium atoms.
FACT: Our galaxy is the milky way and it is a spiral. It take a total of 200 million
years to turn.…read more

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Nebulie formations
Sometimes a nebula just stays at this point, but if the cloud
gets thick enough, with enough hydrogen atoms close
enough together, it can become a brown dwarf
Brown Drawf: A brown
dwarf is a small star that is
not quite big enough, so
there is not enough gravity
to start the nuclear fusion
process. Brown dwarf stars
hardly shine at all, but
they're not very common
either…read more

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Horsehead Nebula
· This nebula is over
1000 light years
away in the
constellation of
Orion.
· It is visible from
Earth only because
it blocks the light
coming from the
stars behind it
· It is a very dark
nebula…read more

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Eagle Nebula
· Cloud formed
of gas and
dust
· It is here that
stars are born
· These can be Neb
seen in this
picture
· The circles
represent
where the
stars can form
from the dust…read more

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Protostar to Main Sequence
· The diagram on the left shows a young sun before it contracted to its present
size
· The collapsing gas heated the core until nuclear fusion began
· The diagram on the right is the sun in its current state
· The sun is no longer contracting because the intense heat within the core is
balanced the inward force of the sun's gravity…read more

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