The distances between telescopes are typically 10 -- 100 km ( 6.2 -- 62.1 mi ) .
Arrays with much longer baselines utilize the techniques of Very Long Baseline Interferometry .
The distances between telescopes are typically 10 -- 100 km ( 6.2 -- 62.1 mi ) , although arrays with much longer baselines utilize the techniques of Very Long Baseline Interferometry .