From a telescope in the South African plains, 1,400 hours of listening to the cosmos have yielded 1.5 petabytes of radio silence turned signal — and now, through a partnership between India's IUCAA in Pune and Germany's Deutsches Zentrum für Astrophysik in Görlitz, that vast archive has found a second home. The opening of a European data mirror for the MeerKAT Absorption Line Survey marks not merely a logistical milestone, but a philosophical one: humanity's collected gaze at the radio universe is being preserved, shared, and prepared for questions not yet fully formed. In building infrastruct
IUCAA's radio survey expands globally with German data gateway launch
ensuring long-term access to the universe's secrets
Mark
So IUCAA finished collecting data last year, and now they're opening it up to the world. Why does Germany get a copy?
Mimi
It's not about favoritism. A single data center is a vulnerability. If something happens to the original archive in Pune, the science is at risk. A mirror in Germany means the data survives, and it also means scientists in Europe can access it faster, without waiting for downloads from India.
Luke
But who pays for this? Is DZA doing this out of goodwill, or is there a formal agreement?
Mimi
The source says they collaborated—IUCAA's IT team worked with DZA's IT group. It doesn't specify funding arrangements or formal agreements, so that's a gap in what we know.
Mark
And this is practice for something bigger?
Mimi
Yes. The Square Kilometre Array will produce vastly more data than MALS did. MALS is 1.5 petabytes. SKA will dwarf that. So DZA is using MALS as a prototype—testing systems and workflows they'll need when SKA comes online.
Luke
How much bigger is SKA going to be?
Mimi
The source doesn't give a number for SKA's expected data volume, so we can't say exactly. But it's described as generating "enormous datasets," which suggests orders of magnitude larger.
Mark
What about the UHF data that's coming next?
Mimi
That's the next release. It covers lower radio frequencies than what's been released so far, which means it can see things the L-band data couldn't—more distant galaxies, clearer views of how gas becomes stars, and patterns in the universe's magnetic fields.
Luke
And scientists are already lined up to use it?
Mimi
The source doesn't say. We know DZA plans to use it for magnetic field mapping, but whether other teams have projects ready, we don't know yet.
Il Polso
- A survey of 1.5 petabytes — equivalent to hundreds of thousands of hours of HD video — has completed its observational phase and now demands the world be able to use it.
- Without redundant, globally accessible infrastructure, data of this scale risks becoming a bottleneck rather than a breakthrough for the international scientific community.
- IUCAA and DZA have built and activated a mirror archive in Görlitz, Germany, giving researchers worldwide a second reliable pathway into the full MALS dataset.
- The German gateway is simultaneously a working data hub and a prototype for managing the far larger datasets expected from the Square Kilometre Array and the deSRC.
- An upcoming UHF band data release will push the survey's reach deeper into cosmic history, enabling studies of early galaxies, star formation, and the universe's magnetic origins.
- The scaffolding is now in place — the science of how the universe became magnetized, and how galaxies grew, is ready to begin in earnest.
From a telescope in the South African plains, 1,400 hours of listening to the cosmos have yielded 1.5 petabytes of radio silence turned signal — and now, through a partnership between India's IUCAA in Pune and Germany's Deutsches Zentrum für Astrophysik in Görlitz, that vast archive has found a second home. The opening of a European data mirror for the MeerKAT Absorption Line Survey marks not merely a logistical milestone, but a philosophical one: humanity's collected gaze at the radio universe is being preserved, shared, and prepared for questions not yet fully formed. In building infrastructure for today's data, these institutions are quietly laying the foundation for tomorrow's telescopes — and tomorrow's understanding of how the cosmos came to be magnetized, structured, and alive with light.
On a Monday in September, a radio astronomy collaboration spanning three continents quietly crossed a threshold. The MeerKAT Absorption Line Survey — led by IUCAA in Pune and conducted using the MeerKAT telescope in South Africa — opened a mirror copy of its data archive at the Deutsches Zentrum für Astrophysik in Görlitz, Germany. The move gave scientists worldwide a second gateway into 1.5 petabytes of radio observations gathered over 1,400 hours of telescope time.
The survey had finished collecting data by the end of 2025, shifting the project from observation into interpretation. Principal investigator Neeraj Gupta described the German mirror as essential to ensuring continuous, long-term access for the global research community. The technical work was coordinated between DZA's IT group and IUCAA's Dhanraj Borgaonkar, who managed the Indian side of the setup.
Beyond redundancy, the gateway carries a larger purpose. Lars Haupt of DZA explained that MALS is being used as a model for building data services capable of handling the even more massive datasets expected from the Square Kilometre Array and the deSRC. In this sense, the archive in Görlitz is as much a prototype as it is a repository.
Three public data releases have already been made, primarily from L-band observations. The next release will introduce UHF band data — lower frequencies that reveal deeper reaches of the universe, earlier galaxies, and richer signals from interstellar gas and molecules. Researcher Aritra Basu noted that DZA plans to use this data to map the polarized radio sky, pursuing one of astronomy's most fundamental open questions: how did the universe become magnetized? The infrastructure activated this week is the foundation on which those answers will be built.
On Monday, a radio astronomy project led from Pune crossed a significant threshold: the MeerKAT Absorption Line Survey, or MALS, opened a second front for accessing its vast collection of observations. The Deutsches Zentrum für Astrophysik in the German city of Görlitz had just completed a mirror copy of the survey's data archive, giving scientists worldwide another pathway to the 1.5 petabytes of raw information the project had gathered.
MALS spent 1,400 hours pointing the MeerKAT radio telescope—located in South Africa—at the sky, collecting radio-wave observations of the universe. To put the scale in perspective: 1.5 petabytes is roughly equivalent to hundreds of thousands of hours of high-definition video. The survey finished its observational work by the end of 2025, which meant the project had moved from the phase of gathering data into the phase of actually using it to answer questions about the cosmos.
Neeraj Gupta, the principal investigator at IUCAA in Pune, framed the German gateway as essential infrastructure. "The DZA mirror ensures continuous long-term access to outputs from this 1.5-petabyte dataset for the global scientific community," he said. The mirror was built through collaboration between the German center's IT group and IUCAA's technical team, with Dhanraj Borgaonkar, a technical officer at IUCAA, coordinating the setup on the Indian side.
But the German gateway is more than just a backup. It serves as a prototype—a test case for how to build data systems that can handle the astronomical datasets of the future. The Square Kilometre Array, or SKA, is coming. It will generate far more data than MALS ever did. Lars Haupt of DZA explained that MALS is being used as a model for building data services that allow researchers around the world to access and work with very large astronomy datasets. The work, he noted, is laying groundwork for both the SKA and the deSRC, a data engineering and science research centre.
Three major public data releases from MALS have already been made, with more on the horizon. Most of what has been released so far comes from observations in the L-band, a range of radio frequencies between 900 and 1,670 MHz. The next significant release will add something new: observations from the Ultra High Frequency, or UHF, band, which covers 580 to 1,015 MHz. This lower-frequency data will give astronomers a deeper view of the radio universe—clearer images, a wider range of signals from atoms and molecules, and the ability to detect more distant galaxies. Researchers will be able to study galaxies as they were in earlier epochs of cosmic history and trace how gas transforms into stars and how galaxies themselves grow.
The UHF data also opens a window onto magnetism. Aritra Basu, a researcher at DZA, said the center plans to use MALS observations to create a detailed map of the polarized radio sky. That map will help scientists understand a fundamental question: how did the universe become magnetized? The data infrastructure that went live on Monday—the mirror in Germany, the systems being built to handle it—is the scaffolding that will support these investigations and many others still to come.
Citazioni salienti
The DZA mirror ensures continuous long-term access to outputs from this 1.5-petabyte dataset for the global scientific community— Neeraj Gupta, principal investigator of MALS, IUCAA
MALS is a prototype for the DZA to lay the groundwork for the SKA and the deSRC work— Lars Haupt, Deutsches Zentrum für Astrophysik
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