G. BRAD LEWIS / SCIENCE PHOTO LIBRARY G. BRAD LEWIS / SCIENCE PHOTO LIBRARY
Keck telescope. Inside the dome of one of the two Keck telescopes on Mauna Kea, Hawaii, USA. The optical telescopes of these American observatories each have a 10 metre diameter mirror, which can be used together to give more detailed images. Mauna Kea, a dormant 4200- metre-high volcano, has several telescopes on its summit.
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