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The telescope you see is still currently active. Its first light was October 12th, 2005. This beauty is located in Mount Graham in Arizona. It is the largest single-mount telescope in the world.

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The LBT uses interferometer to study stars and planets.  

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The LBT uses interferometer to study stars and planets.  

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Light is collected from the two sides of the LBT separately. The LBT uses its near-infrared spectrometer and the other side- optical spectrometer. Most of the time the LBT is observing from both apertures to collect data. “The light from the two primary mirrors can be combined to produce phased-array imaging of an extended field. This coherent imaging along with adaptive optics gives the telescope the diffraction-limited resolution of a 22.65-meter telescope.” (Hill, J. et. Al. (2019)

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"The LBT views space using its two 8.4m- diameter mirrors. That is equal to a single 11.8m mirror with an edge-to-edge baseline of 22.8m."(Large Binocular Telescope Observatory, 2023). The LBT uses 11.8 meter (465-inch) circular apertures.

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The First Ever Made of the Large Binocular Telescopes

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The First Ever Made of the Large Binocular Telescopes

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“Twin laser guide star constellations have recently been installed for ground layer adaptive optics observations. Commissioning of new instruments and focal stations for high resolution spectroscopy and near-infrared phased-array imaging is underway.” (Hill, J. et. Al. (2019)

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About the LBTO. Large Binocular Telescope Observatory.
(2022). https://www.lbto.org/about/
Bison, R. M. (2009). Large Binocular telescope . Large
Binocular Telescope Safford, Arizona. Atlas Obscura .
Retrieved October 6, 2023, from
https://www.google.com/imgres?
Hill, J. M., Ashby, D. S., Brynnel, J. G., Christou, J. C., Little, J.
K., Summers, D. M., Veillet, C., & Wagner, R. M. (n.d.).
The Large Binocular Telescope: Binocular all the time.              NASA/ADS. https://ui.adsabs.harvard.edu/abs/2014SPIE.9145E..02H/abs
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NASA. (n.d.). Large Binocular Telescope Interferometer -
universe instruments - NASA Jet Propulsion Laboratory.
NASA. https://www.jpl.nasa.gov/missions/large-
binocular-telescope-interferometer-lbti
Minnesota Institute for Astrophysics. (n.d.). Large Binocular
Telescope (LBT). Retrieved October 6, 2023, from
https://cse.umn.edu/mifa/research/lbt.