The H-Alpha Sky Scores of well-known nebulae pepper this swath of Milky Way crossing southern Cepheus from Cassiopeia at upper left to the Cepheus/Cygnus border at lower right, but they are merely the brightest islands in an ocean of hydrogen emission. One of the most prominent objects in this field is the nebula IC 1396 at bottom center on the facing page. 24 OCTOBE R 2 019 * SK Y & TELESCOPE