The Sun

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The Sun
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The Sun

• The Sun is our most important star because
• Provides energy for plants and animals
• Its gravitational pull keeps us in orbit
• Produces energy through nuclear fusion
• Temperature and pressure so high inside the sun
  that substances fuse (join together)
• This produces lots of energy

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Nuclear Fusion
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The Sun

• Has been producing energy for 5 billion years.
• It is estimated that the Sun will continue to
  produce energy for another 5 billion years until
  its fuel runs out.
• Is made up of
• Hydrogen (75)
• Helium (25)

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• Solar flares emit charged particles that
• Travel more slowly than light
• Are focused on Earth at the north and south poles
• Interfere with radio wave transmissions
• Produce Aurora Borealis (Northern Lights)