< Page:Popular Science Monthly Volume 87.djvu
This page has been validated.
Fig. 7c. Planetary Nebula, N. G. C. 7.009. Photographed at the Lick Observatory. Two exposures, one short and one long.
This article is issued from
Wikisource.
The text is licensed under Creative
Commons - Attribution - Sharealike.
Additional terms may apply for the media files.