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  • Imagen digital del TMT
    Press release
    The CCI supports the option for the TMT to be installed at the Roque de los Muchachos Observatory
    Statement supporting the selection of La Palma for the Thirty Meter Telescope (TMT) site: The Comité Científico Internacional (CCI) of the Canary Islands Observatories enthusiastically welcomes the possibility that the Thirty Meter Telescope (TMT) may ultimately choose the Observatorio del Roque de los Muchachos (ORM) on La Palma as its site. The ORM offers outstanding astronomical conditions, decades of successful international cooperation in operating telescopes, and a robust legal framework protecting its dark skies. At its meeting on 27 November 2025 on the island of La Palma, the CCI
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  • R1_mass
    Research news
    A physically motivated galaxy size definition across different state-of-the-art hydrodynamical simulations
    Measuring galaxy sizes is essential for understanding how they were formed and evolved across time. However, traditional methods based on l ight concentration or isophotal densities often lack a clear physical meaning. A recent study from Trujillo+20 explores a more physically motivated definition: the radius R 1, where the stellar surface density falls to 1 solar masses per parsec square —roughly the threshold for gas to form stars in galaxies like the Milky Way. In this work, Arjona-Gálvez+25 uses over 1,000 galaxies from several state-of-the-art cosmological simulations (AURIGA, HESTIA
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  • Poster of the Open Days at the IAC and IACTEC Headquarters for Open Government Week 2025
    Press release
    The IAC opens its doors to the public on the occasion of Open Government Week
    The headquarters of the Instituto de Astrofísica de Canarias (IAC) and its technological headquarters, IACTEC, open their doors to the public at their Open Days as part of Open Government Week 2025. This initiative, promoted by the Open Government Partnership worldwide, seeks to bring public administrations closer to citizens and promote the values of transparency, integrity, participation and accountability. The event at the IAC headquarters will take place on Monday 19 May, while the IACTEC will open its doors on Tuesday 20 May. Both days will be held in person, with two visiting hours
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