Summit of Maunakea at Night
The array of radio antennas in the foreground is the Submillimeter Array, operated by the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics.
The observatory on the near side of the ridge is the Subaru Telescope of the National Astronomical Observatory of Japan. A little bit of the Keck Observatory can also be seen next to Subaru.
In the far side of the ridge, from left to right are, the Canada-France-Hawaii Telescope, Gemini-North, University of Hawaii 2.2m Telescope, and the United Kingdom Infrared Telescope.