🔭First images from the Vera C. Rubin Observatory

The Vera C. Rubin Observatory in Chile released its first images on 23 June 2025, from a telescope built to survey the entire southern sky repeatedly for a decade. It will collect far more data than humans can inspect, and it relies on automatic alerts to say what has changed.

This is my product, with better scenery.

A dispatcher at the pilot customer started a Tuesday with 214 open exceptions. Nobody can look at 214 things. This telescope will produce more changes per night than every dispatcher alive could read in a year, and its designers never imagined that anyone would. They built the alert first and the archive second. The stream is filtered by rules that say what counts as worth a human's attention, and everything else is kept without being shown.

I have been arguing since February that the Exceptions Inbox shows too much. The astronomers skipped the argument. They treated attention as the scarce thing from the first drawing.

The thought is filed as 🔍 How much data is too much to look at. The uncomfortable half of it: an alert system is only as good as its definition of interesting, and somebody had to choose that.

What it touches. 📂 Exceptions Inbox general availability closed in March, and the argument about how much the default list should show did not close with it. In August the same thought got its paper and its claim: 💎 Working memory holds a handful of things so the list must hold the rest, with the correction that the limit is counted in chunks, 💡 Miller's seven counted chunks, not items. Freya Nilsen answered the galaxy field with eleven minutes on counting things you cannot see, which I am counting as a citation.

• A real event: on Monday 23 June 2025 a new observatory on a mountain in Chile showed its first pictures.
• The pictures are what the coverage led with. Two nebulae in colours I do not believe, and a field of galaxies so crowded that the foreground stars look like faults on the lens.
• The numbers are what stayed with me. A camera of 3,200 megapixels, the largest ever built for astronomy. The whole southern sky photographed every few nights for ten years. About twenty terabytes of data every night.
• From a first handful of hours of test observing: millions of galaxies, and a couple of thousand asteroids nobody had seen before.
• No person will ever look at most of what it takes. Software compares each new picture with the last and raises an alert when something has moved or changed. Up to millions of alerts a night, they expect.
• Sent the galaxy field to Freya Nilsen in Toronto with the message your plankton, scaled up. She sent back a voice note from a bus, eleven minutes, mostly about counting things you cannot see.