Smithsonian Report. 1931. — Jeans 



Plate 3 



UPPER: Messier lOl in Ursa Major. Lower: a Spiral Nebula in the Big 

 Dipper (Messier 81 in Ursa Major) 



This is one of the most, l>eaiitifnl "stiir-cities" out in space, and was the first observed to be rotating. 

 Its light takes 1,600,000 years to reach us. The central region is unresolved but in the outer portions 

 swarms of stars are visible similar to the very bright stars in our own Galactic System. 



