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Ten Events in the History of the Universe

Ten events spanning the history of the universe organized by powers of ten.

  Date Range Date   Event
1010 tens of billions
of years ago		 13-14 billion
years ago		 Universe began
109 billions
of years ago		 4.5 billion
years ago		 Earth formed
108 hundreds of millions
of years ago		 500 million
years ago		 First fossilized animals
107 tens of millions
of years ago		 65 million
years ago		 Extinction of the dinosaurs
106 millions
of years ago		 3 million
years ago		 First stone tools made
105 hundreds of thousands
of years ago		 300 thousand
years ago		 First modern humans
104 tens of thousands
of years ago		 40 thousand
years ago		 First figurative art
103 thousands
of years ago		 5 thousand
years ago		 First writing
102 hundreds
of years ago		 1492 Columbus: east meets west
101 tens
of years ago		 1969 First people on the moon

Memorize these ten dates as a framework for understanding deep time.