It is over a quarter of a century since the discovery of out?ows
from young stars. The intervening years have led to remarkable
advances in our understanding of this phenomenon. Much of the
progress can be attributed to advances in facilities and
technologies, including not only larger telescopes but also
improved instrument and detector performance. In addition
protostellar out?ows have now been imaged from the ground and space
at high spatial resolution, e. g. with HST, and at a wide - riety
of wavelengths from X-rays to radio waves, revealing more and more
about their physics. This veritable revolution in observation has
been accompanied by an exponential growth in our ability to
numerically simulate the launching and pro- gation of jets. Codes
continue to improve: they now incorporate more physics and are
increasingly ef?cient through, for example, techniques such as
adaptive mesh re?nement and the use of parallel processing in
cluster environments. Simulating the launching and propagation of a
jet all the way from the vicinity of the star up to 4 several
thousand AU (a size range of10 ) is now much closer. In more recent
times, developments in observation, theory and numerical s- ulation
have been joined by laboratory jet experiments reproducing, on
centimetre scales, that which is seen in astrophysics to stretch
for several parsecs.
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