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The Formation of the Earth happened 4.6 Billion years ago.
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The Formation of the Solar System happened 4.5 Billion years ago.
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The formation of the Moon happened around 4.5 billion years ago.
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The formation of the Earth crust and ocean happened 4.5 billion years ago.
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The evolution of prokaryotic cells happened around 4.3-4.4 Billion years ago.
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The heavy bombardment happened around 4.1 to 3.8 Billion years ago.
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The formation of inorganic molecules to organic molecules happened 4 billion years ago.
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Proliferation of cyanobacteria happened 3.5 Billion years ago.
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Oxygen on Earth first formed 2.48 Billion years ago.
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Evolution of eukaryotic cells happened 2 billion years ago.
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Evolution of multicellular organisms happened 600 million years ago.
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The Cambrian Explosion happened 541 million years ago.
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The dinosaurs first appeared around 247 and 240 million years ago.
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The Mass Extinction – CT event happened 66 million years ago.
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The Homo Erectus first appeared 1.8 million years ago. It became extinct around 550,000 years ago.
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If I could go back to witness one event I think it would be the dinosaurs because I want to see them alive.
