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Life on icy bodies (Characteristics and origins (Giant planet satellite…

- - - - low albedo
      - surface water-ice with dark surface dust
    - - Terrestrial
    - - surface made of clean, bright water-ice
- - - - larger the body, the more possibility of life
  - - - near circular prograde orbits
        
        here prograde=orbit same direction as planet
      - possible fragments of larger satellite
        
        tidal forces
        
        collisions
      - bright
        
        presumed icy
    - - "regular satellites"
      - most probably formed from an accretion disc
        
        Triton exception
        
        captured Kuiper belt body
        
        retrograde orbit
      - nearly circular orbits
        
        prograde
        
        near equatorial plane
    - - elongated, inclined, retrograde orbits
      - dark bodies rich in silicates and/or carbon
  - - - carbon dioxide and possibly ammonia on Uranus' satellites
      - Neptune's Triton possibly \(\text{CO}, \text{CO}_{2}, \text{CH}_{4}, \text{HCN}\)
        (hydrogen cyanide)
      - Pluto (not a satellite, but included) surface similar to Triton and including \(\text{CH}_2\text{CHCN}\)
    - - undifferentiated composition
        
        implies not enough heat
        
        implies homogeneous accretion of rocks and ices at same time
      - differentiated structure
        
        rock accreted first, then ices OR homogeneous accretion with enough energy release to cause differentiation