Abstract
Here I shall interpret ‘small-scale’ to mean a few kpc or less. Such jets occur over a wide range of emitted energies (e.g. 1039erg s–1 in M87, 1046 in 3C273) and we do not know if they are manifestations of the same basic phenomenon or whether Nature is fooling us in some way despite the morpholigicaI similarities. For the moment, it seems sensible to assume an underlying unity and to use the observations to explore the jet phenomenon in different guises.With the highest resolutions obtainable with VLBI, our goal is to elucidate the nature and properties of the central energy source. To this end, we can ask various questions which our observations are expected to bear upon both now and in the future. How do jets form and propagate from the energy source? Are the jets ccnfined/colIimated or ballistic? Why are some jets much stronger than others - is this intrinsic or an evolutionary or relativistic effect - or all three? Why are only some sources superlumina Is? Why are most jets ore-sided? Does the relativistic velocity implied by super I urninaI motion on the pc-scale continue into the kpc-scale jets?
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