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The large telescopes

Sir Patrick Moore's guest Professor Richard Ellis from the University of Oxford reviews the world's large observatories and explains their importance.

[The black and white images of Edwin Hubble, George Hale, Mount Wilson, the 200-inch telescope and mirror making in this clip are copyright Palomar Observatories/Caltech]

6 minutes

This clip is from

The Sky at NightLight Fantastic

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