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Photographic and Electronic detectors (1 янв 2000 г. – 1 янв 2020 г.)

Описание:

photographic film or glass plates served as the prime astronomical detectors, whether for photographing spectra or direct images of celestial objects.

Добавлено на ленту времени:

Дата:

1 янв 2000 г.
1 янв 2020 г.
~ 20 years