VII. The Universe and Solar System

1. Big Bang!
   1. expanding universe
      • red shift
      • doppler effect
   2. residual heat
2. development

1. observations (Table 19.3)
   1. flat plane of the ecliptic (fig. 19.1)
   2. rotation
   3. differentiation of terrestrial and Jovian planets
2. development (fig. 19.2)
   1. solar nebula
   2. planetesimals
   3. continued accretion

1. initial accretion
2. melting
   1. gravitational contraction
   2. impact and continued accretion
   3. short half-life radioactive decay
3. differentiation
   1. iron is heavy
   2. iron has low melting temperature