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Cosmological time scale
This is a timeline that attempts to show the best scientific estimates of the age of past events and predictions of the approximate timing of hypothetical future events with cosmological significance. Some locally significant events of interest to members of Homo sapiens are also included. See estimates of the date of Creation for alternative views based on religious tradition. (Note: in this context, billion means 1,000,000,000).
The distant past
- 13.7 ± 0.2 billion years ago: Universe, which includes time and space, begins with Big Bang
- 300 thousand years after the Big Bang, hydrogen nuclei capture electrons, forming the first atoms
- 600 million years after the Big Bang: formation of first galaxies, see Galaxy formation and evolution
- 5 billion years ago: formation of the Sun
- 4.5 billion years ago: formation of the Earth -- start of geologic timescale
- 3.5 billion years ago: first signs of single-celled life on Earth
- 600 to 500 million years ago: multicellular life evolves
The human era
The far future
See also 1017 seconds for times further than 3 billion years into the future.
See also:
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