The answer first
Rubin compares new exposures with reference templates. Significant differences become alert packets that can be classified, cross-matched, and routed within roughly a minute.
Most people should not consume the raw stream. A broker lets you subscribe to an intelligible slice: a sky region, brightness range, motion rate, or source class.
The idea that changes the view
The breakthrough is not one deeper picture; it is a sky that reports every change.
What most explanations leave out
An alert is a prompt for investigation, not a confirmed discovery.
Evidence and named signals
- Difference imaging isolates change.
- Brokers add catalogs and classification.
- Follow-up converts a detection into physical knowledge.
What remains uncertain
Final nightly volumes and false-positive behavior depend on operational performance and filtering.
Why it matters—or what you can observe
Time-domain astronomy makes transients discoverable while they are still changing.
Further reading and primary sources
- Rubin alert streamSource checked 2026-07-16
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