7.1 The Faint Young Sun Paradox: Greenhouse or deep freeze?
  7.1.1 The relevance of greenhouse gases
  7.1.2 A bright young Sun?
  7.1.3 Cosmic rays and a stronger solar wind
 7.2 The Sun’s activity in the young solar system
  7.2.1 Planetary atmospheric chemistry induced by high-energy radiation
  7.2.2 High-energy radiation and the planetary biospheres in habitable zones
  7.2.3 Planetary atmospheric loss and high-energy radiation and particles
  7.2.4 Mercury: Erosion of atmosphere and mantle?
  7.2.5 Venus: Where has the water gone?
  7.2.6 Earth: A CO₂ atmosphere and magnetic protection
  7.2.7 Mars: Once warmer and wetter?
  7.2.8 Venus, Earth, Mars: Similar start, different results?
  7.2.9 Titan: Early atmospheric blow-off?
  7.2.10 Hot Jupiters: Mass evolution by evaporation?
 7.3 Summary: The high-energy young solar system