The next major dome to the right houses a 36-inch telescope now used mostly for imaging. Further to the right beside a thin tower is a 2.1-meter Telescope used currently for imaging and spectroscopy. The unusual triangular building houses the McMath-Pierce Solar Telescope . Kitt Peak recently celebrated its 40th year during which it helped establish the existence of dark matter and the first gravitational lens . Kitt Peak National Observatory is part of the United States' National Optical Astronomical Observatories and is operated under agreement with the National Science Foundation .
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