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Hubble at Palomar Mountain



Hubble in the observer's cage located at the top of the tube of the 200-inch telescope on Palomar Mountain. Astronomers can sit in the cage with their photographic plates to collect light reflected up from the main mirror 55 feet below. Alternatively, collected light can be directed out of the telescope to a more convenient place, but with loss of light for each additional reflection from a mirror redirecting the light.

Image courtesy Mount Wilson and Palomar Observatories.
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