By What Factor Is The Amount Of Light Gathered By The 10-m Diameter Keck Telescope On Mauna Kea, Hawaii, Greater Than That Gathered By The 2.5-m Diameter Mountwilson Telescope?

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1. By What Factor Is The Amount Of Light Gathered By The 10-m Diameter Keck Telescope On Mauna Kea, Hawaii, Greater Than That Gathered By The 2.5-m Diameter Mountwilson Telescope?