Large-Sized Telescope Sub-Array Opens in La Palma
The new facility marks a key step in building the world's most powerful gamma-ray observatory for extreme physics research.
Updated on Oct. 30, 2026 in Physics
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Scientists have inaugurated the Large-Sized Telescope sub-array at the Roque de los Muchachos Observatory in La Palma, Spain. This development is a key milestone for the Cherenkov Telescope Array Observatory, which is designed to eventually become the world's most powerful gamma-ray observatory.
Why it matters
The array aims to advance our understanding of extreme astrophysical phenomena, such as black holes and cosmic particles. It represents a significant expansion in the global infrastructure needed to process massive, high-energy datasets across international borders.
The observatory covers an energy range of 20 GeV to 300 TeV, utilizing one of four off-site data centers, including those at EPFL, to manage annual data volumes reaching tens of petabytes.
The players
Cherenkov Telescope Array Observatory
An international project currently building the world's largest and most powerful gamma-ray observatory.
EPFL
A research university in Switzerland that hosts one of four off-site data centers for the observatory.
Swiss National Supercomputing Center
A high-performance computing facility that provides the computational infrastructure for processing telescope data.
The details
The observatory relies on a massive infrastructure of optics, photodetectors, mechanics, and high-speed electronics to capture gamma rays. These particles interact with the atmosphere to create Cherenkov radiation—faint flashes of light that specialized telescopes then convert into digital signals. The project requires high-speed data transfer to off-site centers where high-performance computing clusters process the incoming streams.
Timeline
October 2026: The Large-Sized Telescope sub-array is officially inaugurated in Spain.
The Tech Race
This development follows the trajectory set by the broader Cherenkov Telescope Array Observatory project to establish a global gamma-ray detection network. It secures a critical data-processing node as the project moves toward its final goal of operating over 60 telescopes.
While the observatory primarily serves the international research community, the data centers involved are pioneering new methods for managing tens of petabytes of scientific data annually. These high-speed processing techniques often filter into broader workflows for big-data storage and high-performance computing.
The takeaway
The inauguration proves that the observatory can successfully manage high-energy data at scale across international borders. Observers should track the future deployment of the remaining telescopes in the northern and southern stations to reach the full 60-telescope capacity.
Further reading
Explore the current state of high-energy observation infrastructure at /science/physics/.
More information
Learn more about the observatory’s mission and technical specifications on the Cherenkov Telescope Array Observatory website.
Source note: This article includes information reported by Swiss Federal Institute of Technology, Lausanne (EPFL).
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