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Galactic Year (period of rotation of the Milky Way galaxy)

Galactic Year (period of rotation of the Milky Way galaxy) (225 million y)

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If Galactic Year (period of rotation of the Milky Way galaxy) (225 million y) was a standard unit ...

  • Age of the Earth (4.54 billion y)...more would be 20 x Galactic Year (period of rotation of the Milky Way galaxy)
  • Time since the end of the Ordovician geologic period (444 million y)...more would be 2 x Galactic Year (period of rotation of the Milky Way galaxy)

Is That A Big Number? - The Book

Yes, there's now a book based on these numbers. Oxford University Press: July 2018.

Click here to learn more about it.

Click here for Podcast: Andrew Elliott interviewed for New Books Network.

http://itabn.tumblr.com/post/138631317782/this-website