VLBI - VERY LONG BASELINE RADIO INTERFEROMETRY

(Davidson et al)

("Very Large Bunch of Investigators")

RADIO SIGNALS FROM QUASARS (ASTRONOMICAL RADIO SOURCES WHICH ARE THE MOST DISTANT OBJECTS IN THE UNIVERSE) ARRIVE AT DIFFERENT RADIO TELESCOPES AT TIMES DEPENDING ON THEIR POSITIONS AND THE SPEED OF LIGHT, SO THE TIME DIFFERENCE GIVES THE POSITIONS OF THE TELESCOPES