1. Mount Palomar, Mount Wilson, and Lowell Observatory
By: Meagan Partridge and Jeffrey Oravic

2. Mount Palomar Observatory
N San Diego County, CA
California Institute of Technology
200-in Hale Telescope
48-in Samuel Oschin Telescope
60-in Telescope
18-in Schmidt Telescope
24-in Telescope

5. Mount Wilson Observatory
1904 by George Hale
60-inch telescope
100-inch Hooker telescope
3 solar telescopes or solar towers
Interferometry

7. Lowell Observatory 1894 by Percival Lowell Research
72-inch Perkins Telescope
42-inch Hall Telescope
Titan Monitor Telescope
Discovery Channel Telescope
24-inch Alvan Clark Telescope