Photo Gallery: Mt. Wilson’s Hooker 100-inch telescope celebrates its 100th anniversary

A board explains the history and facts about the Hooker 100-inch telescope on the 100th anniversary of completion and first successful viewing of the stars, at Mt. Wilson in the Angeles National Forest on Wednesday, Nov. 1, 2017. George Ellery Hale built the telescope in the mountains north of Los Angeles.  (Raul Roa / Staff Photographer)

Mt. Wilson Institute Board of Trustees chairman and CEO Samuel D. Hale stands with the Hooker 100-inch telescope on the 100th anniversary of completion and first successful viewing of the stars, at Mt. Wilson in the Angeles National Forest on Wednesday, Nov. 1, 2017. His grandfather George Ellery Hale built the telescope in the mountains north of Los Angeles.  (Raul Roa / Staff Photographer)

Mt. Wilson Institute Board of Trustees chairman and CEO Samuel D. Hale stands with the Hooker 100-inch telescope on the 100th anniversary of completion and first successful viewing of the stars, at Mt. Wilson in the Angeles National Forest on Wednesday, Nov. 1, 2017. His grandfather George Ellery Hale built the telescope in the mountains north of Los Angeles.  (Raul Roa / Staff Photographer)

Images from the construction of the Hooker 100-inch telescope were displayed on the 100th anniversary of completion and first successful viewing of the stars, at Mt. Wilson in the Angeles National Forest on Wednesday, Nov. 1, 2017. His grandfather George Ellery Hale built the telescope in the mountains north of Los Angeles.  (Raul Roa / Staff Photographer)

A plaque commemorating a visit by Albert Einstein is on a bridge leading to the Hooker 100-inch telescope on the 100th anniversary of completion and first succesful viewing of the stars, at Mt. Wilson in the Angeles National Forest on Wednesday, Nov. 1, 2017. His grandfather George Ellery Hale built the telescope in the mountains north of Los Angeles.  (Raul Roa / Staff Photographer)