Edwin Hubble was one of the
first astronomers
to develop a scheme for classifying galaxies based on appearance.
Since
then, others have modified and expanded on the original scheme, but it
is
a good starting point for organizing my images of galaxies.
The Hubble tuning fork diagram appears in the Hubble Atlas
of Galaxies (by Allan Sandage, still available from the Carnegie
Instituition of Washington) as a way of organizing the different galaxy
classes. Select the symbol for each class to see images of those
galaxies.
