Did you know? Height of the US Presidents' heads carved into Mount Rushmore (18 m) is 40 x Diameter of a regulation dartboard (451 mm)
Diameter of Laniakea supercluster of galaxies (4.92 sextillion km)
/fact/diameter-of-laniakea-supercluster-of-galaxies
Link
If this was a standard unit ...
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.