Keck I and II with meteors. Composite image representing meteors seen above the Keck I and II telescope domes on Mauna Kea, Hawaii, USA. The optical telescopes of Keck I and II each have a 10 metre diameter mirror, which can be used together to provide more detailed images. Mauna Kea, an extinct volcano 4200 metres high, has several telescopes on its summit. Bright meteors, often called fireballs, occur when particles of dust enter the atmosphere and burn up due to friction with the air.`