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In the world · Science · 7 January 2026

SKA: the giant observatory begins to hear hydrogen

In 2025 and 2026 the SKA made its first image, picked up Milky Way hydrogen and linked two dishes as one telescope. What this opens up.

bairogonzalez.com team, drawing on Bairo's story · Published

The SKA Observatory, under construction in Australia and South Africa, has started to listen. In March 2025 it released the first SKA-Low image. In July 2025, the first SKA-Mid dish fitted with a receiver picked up the neutral hydrogen of our galaxy. In January 2026, two dishes worked together as a single instrument. It is a fraction of what it will become, but the observatory that will map the hydrogen of the universe is already listening.

What happened

The SKA is two telescopes with a shared headquarters in the United Kingdom. SKA-Low sits on the lands of the Wajarri Yamaji people, in Western Australia, and listens to low frequencies. SKA-Mid is in the Karoo, in South Africa, with 15-meter parabolic dishes.

On March 17, 2025, the observatory published the first SKA-Low image. It was made with 1,024 antennas, spread across four stations, less than 1% of the planned total. Even so, it showed about 85 galaxies in a patch of sky equivalent to roughly a hundred full Moons. Scientist George Heald said the quality exceeded what the team had expected. When complete, SKA-Low will have 131,072 antennas spread over 74 kilometers.

In July 2025 came the most symbolic moment for anyone who follows the 21 cm line. The first receiver installed on an SKA-Mid dish, sensitive to signals between 950 and 1,700 MHz, measured the telescope's first astronomical signal: the neutral hydrogen coming from the Milky Way.

In January 2026, SKA-Mid took the next step. Two of the seven dishes already assembled jointly observed a galaxy about 2.6 billion light-years away. Astronomers call this "first fringes": the moment when the signals from two antennas are combined and the set starts behaving like a single telescope, much larger than each part. For Director-General Philip Diamond, getting the dishes to work together is a far greater technical challenge than getting them to observe on their own.

Why it matters

Hydrogen is the most abundant element in the universe, and the 21 cm line is the way to see it where light cannot reach. One of the SKA's central goals is to measure this signal on a much larger scale than today: the gas of nearby galaxies, of distant ones, and of the period when the first stars lit up.

There is another, more down-to-earth reason. The SKA was deliberately placed in remote locations, with radio-quiet zones protected by law, because the signal from the sky is extremely faint compared with any human device. It is the same principle as the 1,400 to 1,427 MHz band, where the ITU prohibits all emissions. Radio astronomy depends on a collective good, silence, which exists only as long as everyone agrees to preserve it.

In Bairo's view

For Bairo, the scene from July 2025 says a lot. A new instrument, the product of years of construction, switches on its receiver and the first thing it hears is hydrogen, the signal he calls the frequency of silence. In his reading, it is the place that anyone who listens eventually reaches.

He also recognizes in the SKA the logic that guides what he has built: many small pieces, each limited on its own, that gain strength once they start working together. Bairo describes the ecosystem he founded as a body, in which the whole sees farther than its parts. The metaphor is his, and each front remains a distinct company.

The 1420, for him, remains what it has always been: a symbol of silence and listening, measured by the 21 cm yardstick. No one transmits on 1420 MHz. The SKA, like every radio telescope, only listens.

And there is the other half of listening, which is keeping well what was heard. The SKA will produce data for decades. In Bairo's reading, any record that needs to last that long also needs protection that lasts, and that is the benefit he proposes with qrqbits: post-quantum cryptography, designed to stay secure when quantum computers mature.

Where this meets the ecosystem

1420mhz, created by CLAIN, takes its name from this frequency because of what it represents. CLAIN's proposal, still in development, is to orchestrate many niche artificial intelligence agents, each a specialist in one task, so that the whole delivers to a person what no single agent could. It is an idea of arrangement, not a technical relationship with the radio telescope.

On the BTZ Chain, the tribute to the hydrogen line is digital: a record written on the network, without touching the protected band. The relationship with the SKA is one of inspiration, not partnership. None of Bairo's fronts takes part in the observatory.

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In the world: Science