Publications of the Lick Observatory – Owl Nebula – 1908 Photogravure
This is plate 27 – «The Owl Nebula M 97 Ursae Majoris». Keeler’s photographs are early and beautiful examples of astrophotography and what they revealed did much to expand our knowledge of the universe.
Publications of the Lick Observatory – Lagoon Nebula – 1908 Photogravure
This is plate 56 – «The Nebula M 8 Sagittarii». Keeler’s photographs are early and beautiful examples of astrophotography and what they revealed did much to expand our knowledge of the universe.