![Mount Wilson Observatory on Twitter: "This is what the 100" primary mirror sees when the mirror shutter opens. A rare view of the Hooker telescope's interior, secondary, and tertiary mirrors courtesy of Mount Wilson Observatory on Twitter: "This is what the 100" primary mirror sees when the mirror shutter opens. A rare view of the Hooker telescope's interior, secondary, and tertiary mirrors courtesy of](https://pbs.twimg.com/media/EyAoW30VEAE4cq_.jpg)
Mount Wilson Observatory on Twitter: "This is what the 100" primary mirror sees when the mirror shutter opens. A rare view of the Hooker telescope's interior, secondary, and tertiary mirrors courtesy of
![4.2. The Hooker Telescope (2.5m) used by Edwin Hubble for the discovery... | Download Scientific Diagram 4.2. The Hooker Telescope (2.5m) used by Edwin Hubble for the discovery... | Download Scientific Diagram](https://www.researchgate.net/publication/261993744/figure/fig2/AS:392437475364868@1470575793137/2-The-Hooker-Telescope-25m-used-by-Edwin-Hubble-for-the-discovery-of-the-expansion.png)
4.2. The Hooker Telescope (2.5m) used by Edwin Hubble for the discovery... | Download Scientific Diagram
![Edwin Hubble at the controls of the 100-inch Hooker Telescope at Mount Wilson (~1922). Here he was to discover that the Universe was not entirely contained within the Milky Way (as was Edwin Hubble at the controls of the 100-inch Hooker Telescope at Mount Wilson (~1922). Here he was to discover that the Universe was not entirely contained within the Milky Way (as was](https://i.redd.it/3anontfg43241.jpg)
Edwin Hubble at the controls of the 100-inch Hooker Telescope at Mount Wilson (~1922). Here he was to discover that the Universe was not entirely contained within the Milky Way (as was
![Dome of 100” Hooker Telescope, Mount Wilson Observatory, California via Instagram [Photography] | My Word with Douglas E. Welch Dome of 100” Hooker Telescope, Mount Wilson Observatory, California via Instagram [Photography] | My Word with Douglas E. Welch](http://welchwrite.com/blog/wp-content/uploads/2022/04/mount-wilson-dome.jpg)
Dome of 100” Hooker Telescope, Mount Wilson Observatory, California via Instagram [Photography] | My Word with Douglas E. Welch
![Hooker 100-inch reflecting telescope, Mount Wilson Observatory. - Photographs - Huntington Digital Library Hooker 100-inch reflecting telescope, Mount Wilson Observatory. - Photographs - Huntington Digital Library](https://hdl.huntington.org/digital/api/singleitem/image/p15150coll2/888/default.jpg)
Hooker 100-inch reflecting telescope, Mount Wilson Observatory. - Photographs - Huntington Digital Library
![This Month in Astronomical History: 100 Years for the Hooker Telescope | American Astronomical Society This Month in Astronomical History: 100 Years for the Hooker Telescope | American Astronomical Society](https://aas.org/files/astro-history-november-hooker-telescope-caption.png)