Neat Ratios ...
Age of the Earth (4.54 billion y)
- is about as big as Time since the start of the formation of the Solar System (4.6 billion y)...more
- is 20 x Galactic Year (period of rotation of the Milky Way galaxy) (225 million y)...more
- is 200 x Time since the end of the Paleogene geologic period (23 million y)...more
If this was a standard unit ...
