Keck Observatory Marks 25 Years of World-Class Astronomy

On Tuesday, the elder of the twin telescopes of the W.M. Keck Observatory will celebrate the 25th anniversary of its "first light" operations perched atop Mauna Kea on Hawaii Island.

The milestone comes as the planned construction of the world's largest optical telescope, the Thirty Meter Telescope, was delayed once again. Meanwhile, Keck I and Keck II (…