Very Long Baseline Array

The Very Long Baseline Array (VLBA) is an interferometer consisting of 10 25-meter radio telescopes spread across North America from Hawaii to the Virgin Islands supporting a maximum baseline of 5300 miles, i.e., very-long-baseline interferometry (VLBI). Its control room is in Socorro, New Mexico. It observes wavelengths from 28 cm to 3 mm in eight bands plus two narrow longer-wavelength bands.

It is also used with additional radio telescopes for longer baselines, known as the HSA (for High-Sensitivity Array). This gives them angular resolutions for the shorter wavelengths as small as fractions of a milliarcsecond.