Interferometry
A technique that combines signals from multiple telescopes to create sharper images and precise locations of distant objects, like pinpointing where a cosmic burst came from.
A method in astronomy that combines electromagnetic waves collected by two or more separated telescopes to create images with much higher resolution than any single telescope could achieve. By analyzing how the waves interfere with each other, astronomers can locate and map distant objects with extreme precision, down to milliarcsecond scales.
What this means in real life
If two people stand far apart and listen to a distant siren, they hear it at slightly different times. By comparing those tiny time differences, they can pinpoint exactly where the siren is—similar to how interferometry uses timing differences between telescopes to locate a distant star or cosmic explosion.
What it isn’t
It is not simply using multiple telescopes pointed at the same object. Interferometry requires precise synchronization and analysis of how the signals interact; just pointing several telescopes at something without combining their data that way produces no interferometric benefit.
Commonly misused online
People often use 'interferometry' to mean any multi-telescope observation, when it specifically refers to the mathematical combination of signals to exploit wave interference. Posting a photo from 'interferometric imaging' when it's just a composite from separate telescopes misses the technical distinction.
Based on 1 reference source, including primary sources. Last verified July 16, 2026.