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Published online by Cambridge University Press: 23 September 2016
Intermediate to late stages of star formation are characterized by rising infrared and visible luminosities, with much of the most interesting physics concentrated in the inner regions within the immediate vicinity of the central protostar(s). Long-baseline optical and infrared interferometry is ideally suited to study of such bright, compact structures. Contributions from presently operational arrays, which are capable of resolving the brightest few dozen, will be reviewed. These results presage the potential for further dramatic advances in our understanding of star formation with observations from more advanced instruments now being built.