In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

Pinpointing a Milepost Marker Star that Opened the Realm of Galaxies At the dawn of the 20th century, astronomers faced a ...

If we could go back 101 years, we would encounter a time when scientists still thought the Milky Way was the entirety of our ...

Undiscouraged, Dr. Bowen points out that the 100-inch telescope on Mt. Wilson did not work acceptably for a year and a half. He predicts that the 200-inch will eventually be fixed. The first step ...

Telescope size is generally assessed by the diameter of the primary mirror. With a 100-inch (2.5-meter) diameter mirror for collecting light, the Hooker telescope at Mount Wilson was the largest ...

100 years of Mount Wilson’s 100-inch telescope, the first to discover the universe Happy 100th birthday to the 100-inch telescope, best known for being the first to see beyond our Milky Way galaxy.

A Schmidt-Cassegrain 8-inch telescope. SBO possesses two 8-inch diameter Schmidt-Cassegrain telescopes. One is a Celestron (on long-term loan from John Bally) that was mounted piggyback on the 18-inch ...

The 18-inch telescope was erected on the open Observing Deck of the newly-built Fleischmann Addition of SBO in 1982. This telescope was the first commercial telescope ever built and sold by the ...