Very Long Baseline Interferometry (VLBI)
A radio-astronomy technique that combines signals from telescopes separated by hundreds or thousands of kilometres (up to intercontinental baselines) to achieve sub-milliarcsecond angular resolution — orders of magnitude finer than any single dish.
Relevance to UAP / astrobiology vault
- BRaTs follow-up tier. In michael-a-garrett’s May 2026 BRaTs framework (src-brats-radio-technosignatures-2026-05), VLBI is the second observational stage after wide-field SKA surveys: candidate broadband technosignatures flagged by SKA are imaged at VLBI resolution to test for sub-milliarcsecond astrometric co-motion with nearby Galactic stars and exoplanets — the strongest discriminator separating planetary-scale leakage from extragalactic radio sources.