posted on Nov, 29 2012 @ 08:17 AM
Black holes suck material toward them, but some of it gets spit out rather than swallowed. Many black holes eject jets that move away from the
accretion disk at nearly the speed of light. These jets have been observed most spectacularly from the centers of nearby galaxies (for example, M87)
but also appear in microquasars - in quick, enormously energetic spurts and sputters, as if someone had taken a video of a quasar jet and pressed the
The processes by which these jets are formed are not well understood, but seem to require magnetic fields - whose presence causes instabilities in the
accretion disk that allow material to fling upwards - as well as rapidly rotating black holes, which can feed some of their energy to the magnetic
field and to the jet material itself.