Astrophysical jets are associated with the formation of young stars of allmasses, stellar and massive black holes, and perhaps even with the formation ofmassive planets. Their role in the formation of planets, stars, and galaxies isincreasingly appreciated and probably reflects a deep connection between theaccretion flows - by which stars and black holes may be formed - and theefficiency by which magnetic torques can remove angular momentum from suchflows. We compare the properties and physics of jets in both non-relativisticand relativistic systems and trace, by means of theoretical argument andnumerical simulations, the physical connections between these differentphenomena. We discuss the properties of jets from young stars and black holes,give some basic theoretical results that underpin the origin of jets in thesesystems, and then show results of recent simulations on jet production incollapsing star-forming cores as well as from jets around rotating Kerr blackholes.
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