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Question:
Astronomical time periods
Answer:
EONS
Length:
4
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Time periods of note
Immeasurably long periods of time
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Lengthy time periods
Brief time periods
''-zoic'' time periods
Evolutionary time periods
Time line periods
Memorable time periods
Historic time periods
Notable time periods
Very long periods of time
Astronomical time span
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Time periods lasting about 29 1/2 days