• The Sun is Earth’s main source of energy.
  • The Sun changes hydrogen into helium through nuclear fusion.
  • The energy travels to Earth mostly as visible light.
  • We can use sunlight as an energy resource, called solar energy.
  • Solar energy is clean and renewable.
  • It does not produce any pollution, and there is plenty of it available.
  • But solar energy has problems.
  • It doesn't shine at night.
  • Until solar technology becomes more affordable, most people will prefer to get their energy from other sources.
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