Explorations: Introduction to Astronomy (Arny), 6th Edition

Chapter 11: Meteors, Asteroids and Comets

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  • The Sun is an immense ball of gas.
  • Gravity holds it together.
  • Gas pressure prevents it from collapsing under the force of its gravity.
  • Nuclear reactions in its core supply its power.
  • Motions in the Sun’s interior generate magnetic effects.
  • The Sun’s magnetism changes over time.
  • Solar magnetism affects Earth:
    • It creates the aurora.
    • It appears to affect our climate.

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