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Cross in front of the Nuestra Senora de los Remedios Church on top of the Great Pyramid with Popocatepetl Volcano in the background, Cholula, Puebla State, Mexico

Winding road crossing the volcanic landscape towards Sicasumbre Astronomical Observatory, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Empty road crossing the barren mountains of Pajara at dawn from Sicasumbre observatory, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Bronze plaque pointing out mountain peaks seen from Dee Wright Observatory at McKenzie Pass in the Cascade Mountains of Oregon, with North Sister and Middle Sister volcanic peaks in the distance.

Bronze plaque pointing out mountain peaks seen from Dee Wright Observatory at McKenzie Pass in the Cascade Mountains of Oregon, with North Sister and Middle Sister volcanic peaks in the distance.

Submillimeter Array, SMA, consisting of eight radio telescopes at a height of 4080m near the summit of the extinct volcano Mauna Kea, Hawaii, USA

Submillimeter Array, SMA, consisting of eight radio telescopes at a height of 4080m near the summit of the extinct volcano Mauna Kea, Hawaii, USA

Domes of the Subaru Telescope and the two Keck Telescopes near the summit of the extinct volcano Mauna Kea, Hawaii, USA

Infrared Telescope Facility, IRTF, telescope for infrared astronomy at the Mauna Kea Observatory on the summit of the Mauna Kea volcano, 4205m, with clouds below, summit of the Haleakala volcano on the Island of Maui at back, Mauna Kea, Hawaii, USA

Mauna Kea Observatory, Subaru Telescope, Keck Observatory and Infrared Telescope Facility, Mauna Kea Ice Age Natural Area Reserve, Big Island, Hawaii, USA, North America

Mauna Kea Observatory on the summit of the Mauna Kea Volcano, 4205m, right the Gemini Observatory, left the Canada-France-Hawaii Telescope, CFHT, Mauna Kea, Hawai'i, USA

Mauna Kea Observatory on the summit of the Mauna Kea volcano, 4205m, Gemini Observatory, right, Canada France Hawaii Telescope, CFHT, at back, Mauna Kea, Hawaii, USA

Hawaiian temple on the summit of the Mauna Kea Volcano, 4205m, part of the Mauna Kea Observatory on the horizon, Mauna Kea, Hawai'i, USA

Science City with observatories on the summit of the Haleakala Volcano, Haleakala National Park, Maui Island, Hawaii, USA

Mauna Kea Observatory on the summit of the Mauna Kea Volcano, 4205m, the United Kingdom Infrared Telescope, Mauna Kea, Hawai'i, USA

Observatories on Mauna Kea at sunset on the Island of Hawaii, Island of Hawaii, Hawaii, United States of America

Decommissioned Caltech Submillimeter Observatory atop Mauna Kea with view to Mauna Loa, Island of Hawaii, Hawaii, United States of America

Decommissioned Caltech Submillimeter Observatory atop Mauna Kea with view to Mauna Loa, Island of Hawaii, Hawaii, United States of America