Astronomy 5

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Author:
Anonymous
ID:
250530
Filename:
Astronomy 5
Updated:
2013-12-03 18:36:29
Tags:
Astronomy
Folders:
College,Astronomy
Description:
Astronomy cards to study for finals
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  1. Solar energy comes from...
    nuclear of H to He
  2. Equation for Solar energy
    proton-proton chain - 4 H = 1 He + energy + neutrinos
  3. Layers of the sun
    • Corona - thin, million-degree “atmosphere” (X-rays)
    • Chromosphere - thin UV “atmosphere”  
    • Photosphere - visible layer of sun, ~6000 K
    • Convection zone - hot plasma rises, cool sinks
    • Radiation zone - energy travels by radiation (over long times!)
    • Core - nuclear fusion of H to He; ~15 million K
  4. Sunspots
    • dark spots on the photosphere
    • appear in groups
    • cooler than rest of sun
    • caused by magnetic activity
  5. Solar flares
    • caused by high magnetic activity
    • send burst of x rays and charged particles into space
    • on 11 year cycle
  6. Solar cycle
    11 year cycle - megnetic fields twisted by differential rotation
  7. Solar Prominences
    • eruption high above the sun's surface
    • caused by magnetic activity
  8. Coronal Mass ejections
    send burst of energetic charged particles out through the solar system
  9. Gravitational Equilibrium
    energy provided by fusion maintains the pressure
  10. What time does a a full moon set?
    around 6 A.M.
  11. Constellation visibility is based on
    • Place on planet 
    • the location of Earth in its orbit
  12. Celestial equator
    It represents an extension of the Earth's equator onto the celestial sphere
  13. Circumpolar stars
    always remain above your horizon
  14. Why do we see the same face of the moon
    because the moon's rotational and orbital periods are equal
  15. Solar eclipse requires..... for a total?
    • The phase of the moon to be new and the nodes of the moon's orbit must be nearly aligned with the earth and the sun
    • total - the moon's umbra must touch the area where you are located
  16. Retrograde
    As the Earth passes another planet, the other planet appears to move backward with respect to the background stars, but the planet's motion does not really chnage
  17. What was wrong with Copernicu's first sun centered model?
    perfect circle orbits of planets

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