25 September 2009

Timeline of life

As measured in galactic years - one galactic year is the time it takes for our galaxy to make a complete revolution.

0 GY - Our sun is born.
4 GY - Oceans appear on Earth.
5 GY - Life begins in its simplest form.
7 GY - Bacteria appear.
10 GY - Stable continents develop.
16 GY - Multicellular life evolves.
19.999 GY - Homo sapiens sapiens evolves.
20 GY - Now.

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