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4.1 The Sun is our Local Star
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4.1 The Sun is our Local Star

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This is the presentation that will be presented on Wednesday November 18th 2009. It follows directly from the McDougal Littell: Space Science text.

This is the presentation that will be presented on Wednesday November 18th 2009. It follows directly from the McDougal Littell: Space Science text.

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  • 1. The Sun is our local star
    Space Science
    Chapter 4: Section 4.1
  • 2. The sun:What is the sun made of? Is it a solid? A liquid? Or a gas?
    Gas- made mostly of hydrogen and helium
  • 3. Is the Sun consistent? Or does it have layers?
    The sun has 6 layers
  • 4. How does the sun make it’s energy?
    Fusion- the process in which hydrogen is converted into helium
  • 5. Review: What is mass?
    Anything that has matter and takes up space
  • 6. How massive is the sun?
    Contains 99.9% of the mass of the entire solar system
  • 7. Layers of the sun
  • 8. The sun’s interior
    Where fusion takes place
    Nuclear reaction, not chemical
    Reaches 15 million degrees Celsius
    Radiative Zone
    Energy moves by radiation through this thick layer
    Conditions not extreme enough for fusion to occur
    Convection Zone
    Convection- the transfer of energy from place to place by motion of heated gas or liquid
    the currents of this hot gas carry energy towards the Sun’s surface
  • 9. Sun’s interior
  • The sun’s atmosphere
    The sun’s surface- the part you see when you look at the sun
    Convection currents break through this layer
    Making it appear bumpy in texture
    Thin middle layer
    Gives off pinkish layer
    Low density, outer most layer
    Only seen during a total eclipse
  • 12. Sun’s atmosphere
  • 13. Sunspots
    Spots on the photosphere that are cooler than surrounding areas
    Appear dark but are bright
    • Seem dim because rest of photosphere is much brighter
    Finding Sunspots Activity
    Light bulb Sun
    Index cards
  • 14. Sunspots
    Follow 11 year patterns
    During peak season, dozen of sunspots appear
  • 15. The more sunspots there are, the cooler earth is.Why?
    NASA claims that in 2008 the sun had the fewest sunspots since 1913 and that is the reason for the cooler weather in the northern hemisphere.
  • 16. Prominences
    Large bright features extending outward from the sun’s surface
    Anchored to the photosphere
    May be thousand of km in length
  • 17. prominences
    Made of ionized gases called plasma
  • 18. Solar winds
    Electrically charged particles that flow in all directions from the cornoa
    Deflected by the magnetic poles
  • 19. Solar winds
    Approximate size of Earth for comparison
  • 20. Auroras
    When the energy is released into the upper atmosphere of Earth they create auroras
    Also known as northern or southern lights
  • 21.
  • 22.
  • 23.
  • 24. NASA matching sun activity
  • 25. How are the images similar? Different?
  • 26. The yellow UV images show regions of intense activity above the surface of the sun
    The black and white images show regions of magnetic connections break and reconnecting
    Many of these areas appear as sunspots in simple images of the sun
  • 27. http://www.youtube.com/watch?v=PaSFAbATPvk