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physical phenomena > event > era

era
subject			fact

era	is a kind of event
	has definition A system of chronological notation reckoned from a given date.
	has start time
	has duration
event	has synonym world point
	has time of occurrence

Kinds of era :

• Big Bang era (8 kinds, 65 facts) - A theoretical era postulated to have occurred after the Big Bang. They are in order :
  1. Planck era
  2. hadron era
  3. inflation era
  4. lepton era
  5. nucleosynthetic era
  6. radiation era
  7. matter era
• geological era (26 kinds, 73 facts)