Our Star

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Our Star
The Sun
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General characteristics of the sun

• Closest star
• Source of all life on Earth

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Where do these plants get their energy? Where do
they get their food?
The Sun
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Then where does the sun get its energy?

• Every second 4 ½ million tons of mass in the sun
  is converted to radiant energy
• Thermonuclear Fusion
• H H ? He and energy
• (lots of it!)

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How long has the sun been around?

• It is a typical middle-aged star
• Formed around 5 billion years ago and will be
  around for about another 5 billion years
• Not a solid, liquid, or a gas -- plasma

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How hot is the sun?

• The sun is around 5800 K
• So, what does that mean to me?
• IF OC5/9(OF-32O) THEN what is the
• OF9/5OC32O temperature of the
  KOC273
  sun in OF?

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One of the layers of the sun has solar wind,
which creates the Aurora Borealis
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The Suns Rotation

• Has axial spin
• Different regions spin at different rates
• Equator once every 25 days
• Higher latitudes once every 36 days

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The Sun
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The Sun
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How big is the Sun?

• Lets compare it to other stars in the universe.

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Now about the Earth and Moon
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You know that the Earth is a sphere.
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How do you know thatthe Earth is a sphere?
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Neil Armstrong July 20, 1969
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Do you notice anything in common?
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Why do we seeonly one side of the moon?
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Phases of the Moon

• Why does the Moon change over time?

Time to get up and move!
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Solar Eclipse
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LunarEclipse
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Why do we have eclipses?

• Why dont we have eclipses every month?

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Origin of the Moon

• The Large impact theory
• The earth, early in its formation, was struck a
  glancing blow by some large object
• Evidence to support this theory
• The moons density to the density of the
  earths crust
• The Atlantic ocean is deep and wide enough to
  account for the moons material
• Earth is rotating too fast to fit other models