Stars and constellations

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Stars and constellations

• By Graham

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History

• Stars start out as defused gas clouds and dust
  drifting through space.
• The force of gravity slowly pulls these clouds
  closer together.
• If the clump is large enough pressure caused by
  gravity inside a protostars begins to generate
  heat.
• The heat and pressure builds until nuclear fusion
  reactions begins to take place in the core.
• The force of gravity pulls the hydrogen atoms
  together.
• Smashing and fusing them into heavier helium
  atoms.
• The process generates an enormous amount of
  energy and the star ignites.
• Entering its main sequence our star, the sun is
  in this stage right about now,half way through
  its ten billion year long life.
• Eventually our sun will use up all of its
  hydrogen.
• At this point the suns core will expand,
  ballooning to many times its current size right
  now.
• Stars that are in this stage of their lives are
  called Red Giants. theyre called Red Giants
  because their surface cools and turns red.
  Theyre also huge!
• The star is now burning helium, fusing it into
  even heavier elements.
• Since these reactions arent nearly as powerful
  as burning hydrogen the star will begin to
  collapse after about ten million years.

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Statistics
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Interesting Facts

• There are at least sixty-five different types of
  constellations.
• Stars come in many shapes.
• The suns radius is about four thousand three
  hundred and two miles.

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Physical Appearance
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Bibliography

• Brainpop
• World book