MARTIN BOND / SCIENCE PHOTO LIBRARY MARTIN BOND / SCIENCE PHOTO LIBRARY
Copper planetarium dome. View of people queuing outside the London Planetarium, England. The copper dome has been oxidised by oxygen and water to form the green compound copper hydroxide. Inside the Planetarium is an optical system that projects images of the night sky onto the inner surface of the dome. This allows the positions and movements of astronomical objects like stars and planets to be shown.
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