How can matter be ejected from a black hole?

For The First Time Ever, Astronomers Have Observed a Black Hole Ejecting Matter Twice. When they consume matter such as gas or stars, they also generate a powerful outflow of high-energy particles from close to the event horizon, but not beyond the point of no return.

How do black holes emit jets?

As the plasma falls in, it delivers weak magnetic field lines to the hole. Field lines gradually accumulate on it and are kept there by the influx of plasma. Eventually the black hole twists up this tangled field enough to launch a jet.

Can anything escape the event horizon of a black hole?

Since general relativity states that nothing can travel faster than the speed of light, nothing inside the event horizon can ever cross the boundary and escape beyond it, including light. Thus, nothing that enters a black hole can get out or can be observed from outside the event horizon.

Does a black hole emit anything?

As this article will show, due to vacuum fluctuations of quantum fields in the vicinity of its surface (the so-called event horizon), the black hole emits particles, such as photons (particles of light), neutrinos and others. Black holes, therefore, are not completely black!

What happens to a star if it passes too close to a black hole?

A star that wanders too close to a black hole (top left) is stretched into a thin strand. Some of the star material is thrown back into space, as this illustration shows. The rest swirls around the black hole, crashing into itself and forming a disk of superheated gas.

How powerful are black hole jets?

When material from this disk falls toward the black hole, the plunging debris gets so hot that it shines more brightly than the whole rest of its galaxy. One in 10 of these active black holes also produces jets that fire out particles at 99.995\% of the speed of light.