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| Picture credit:
http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/spectroscopy.htm |
Nebulas,
By Lily Satterlee
Do you wonder where stars
come from? The answer is nebulas. They’re a large cloud of dust and gas. Behind
the clouds are new born stars. It is mostly hydrogen and helium.
How these
stars are are made is movement in the nebula causes clumps to form of elements and
debris. These clumps increase the gravity around them as their mass grows.
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| Evolution of a star; from nebula birth to solar system. Picture credit: http://www.daviddarling.info/encyclopedia/N/nebhypoth.html |
The
gravity attracts more elements and debris and the clumps increase in mass and
gravity more. The increase in mass and gravity also cause an increase in
density and energy to make… a star.
The most famous nebulas are the Orion nebula and the
eagle nebula which has the pillars of creation.
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| Orion Nebula picture by the Hubble Telescope |
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| The Pillars of Creation in the Eagle Nebula, Hubble Photo |
Nebulas are also where stars
die. When a star dies the nebula reacts.
As you can see our galaxy would
not be what it is with out the nebula.
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| Butterfly Nebula, Hubble Photo. |
