Gemini Instrument Support Structure + instruments

The back end of the Gemini North telescope, tilted down, showing the suite of scientific instruments mounted on the Instrument Support Structure (ISS). The Gemini Near-Infrared Imager (GNIRS) is on the uplooking port, the Gemini Multi-Object Spectrograph (GMOS) is on the right-side port, and the Near-Infrared Imager (NIRI) is on the left side port.