Rachel, age 9 asks… Where is the biggest telescope on the Earth?
The Keck Telescope is on the largest Island-mountain on the Earth called Mauna Kea in Hawaii. It is a 1000 centimeter diameter telescope. It is the largest optical telescope. The observatory is so high up the mountain (13,800 feet) that astronomers and visitors often experience headaches and dizziness on the mountain top because of the low oxygen level.
