The multimillion year time frame within which scientists believe the earth has existed, and which is supported by the observation of natural, mostly geological, phenomena.
- The question of how the Sun shines - that is, the source of its energy - did not become a matter of concern among scientists until the concept of geological deep time was established.
- The most unsettling aspect of geological deep time was the loneliness of pre-Adamic history, a time span of many millions of years that had gone unwitnessed by human eyes.
- On the scale of deep time, or within the scope of a system as complex as a planetary ecosystem, it is not even theoretically possible to determine cause and effect.
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