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Large Millimeter Telescope

The Large Millimeter Telescope (or Gran Telescopio Milimétrico Alfonso Serrano) is the world´s largest single-dish steerable millimetre-wavelength telescope designed specifically for astronomical observations in the wavelength range of 0.85 – 4mm. This binational project between México and the United States of America represents the largest and most complex scientific instrument constructed in México. Situated on the summit of Volcán Sierra Negra at an altitude of 4600 meters, the LMT has begun its exploration of the physical processes that lead to the formation and evolution of planetary systems, stars, black-holes and galaxies thoughout the 13.7 billion year history of the Universe.

March 9, 2026 – The LMT joins the EHT in new observing campaign

During the next two months, the LMT together with the EHT will produce the first “movie” showing the variability of the plasma moving around the supermassive black hole of the M87 galaxy.

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January 21, 2025 – The LMT joins EHT dress rehearsal observations

The LMT successfully participated in the Event Horizon Telescope (EHT) dress rehearsal observations, demonstrating that the telescope and its instrumentation are ready to participate in the upcoming 2025 EHT observing campaign.

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