Astronomy -- Mount Wilson and Palomar Observatories, 1959
Supplementary material reads: "Meade -- from photos. Mount Wilson and Palomar Observatories Photo. Messier 51, and extragalactic spiral nebul in the constellation of Canne Venatici, as photographed with the 200-inch Hale Telescope of the Palomar Observatory, operated jointly with the Mount Wilson Observatory by the California Institute of Technology and the Carnegie Institution of Washington. This is the 'late' type spiral with an 'irregular companion. The pair lies at a distance of about three million light years (pr 18 million million million miles) from earth. The contrast between the contents and structural patterns of the two systems is conspicuous. It illustrates the current conception of two distinct types of stellar populations: Type I, found in the arms of late spirals, and Type II, found in elliptical nebulae, early spirals and the nuclear regions of intermediate spirals. It was the Messier 51 that a spiral pattern was first detected by Lord Rosse in 1845. A 'Milky Way System', different from our own, 3 million light-years away: about 1200 billion suns, 'stars', both older than our sun, of the same age and younger -- with many life bearing planets around them...". More detailed information can be found with negatives.