Glass plate X4709 used by Cecilia Payne-Gaposchkin in the late 1920s during her PhD research on stel
Glass plate X4709 used by Cecilia Payne-Gaposchkin in the late 1920s during her PhD research on stellar atmospheres [Harvard-Smithsonian Center for Astrophysics, Photographic Glass Plates] -- source link
#astronomy#astrophysics#visual writing#cecilia payne-gaposchkin