Before CCDs were invented,what was the device most commonly used for imaging with optical telescopes?

Question

Quizplus · Accepted Answer

Photographic glass plates were the most commonly used device for imaging with optical telescopes before the invention of CCDs. These plates were coated with a light-sensitive emulsion and could capture images of the night sky. Each plate had to be manually developed, making the process time-consuming and labor-intensive.

Before CCDs Were Invented,what Was the Device Most Commonly Used