Blue Ridge Mountains | Oak Ridge National Laboratory | Oak Ridge, Tennessee | Royal Observatory, Greenwich | Magdalena River | Tom Ridge | observatory | Royal Observatory | Paris Observatory | Palomar Observatory | Yerkes Observatory | Oak Ridge | Magdalena | Arecibo Observatory | Siding Spring Observatory | Mount Wilson Observatory | Smithsonian Astrophysical Observatory | Observatory | Maple Ridge, British Columbia | Harvard College Observatory | Ondřejov Observatory | Lowell Observatory | Kew Observatory | Heartbreak Ridge | Blue Ridge Parkway | Basking Ridge, New Jersey | Roque de los Muchachos Observatory | Ridge-and-Valley Appalachians | Pulkovo Observatory | Pine Ridge Indian Reservation |
It is named after William H. Ryan, an astrophysicist at the Magdalena Ridge Observatory in Socorro County, New Mexico.