An uncropped version available at NASA's "Astronomy Picture of the Day". According to the NASA site:
Since no copyright statement is attached to this photograph, it is presumed to be public domain in the U.S.
The Swiss copyright on this image expired at the end of 1992.
The author died in 1942, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 80 years or fewer.