Here is the particular explanation these scientists used to solve the problem.

Astronomers from the University of California, Berkeley ran a number of simulations to figure out how changes in these magnetic fields affect jet lifespans, and found that the only way a jet can withstand being shot across an entire galaxy is if it’s being propelled by stable magnetic fields from the black hole.

The more stable the magnetic fields, the more likely a jet is to be broader and stronger, which makes it able to survive the bumps and obstacles it faces as it erupts from the centre of the galaxy.

Apparently this stability can vary a lot from galaxy to galaxy.  Who knew?  That is so cool.

And in a related video, check this out:

Astronomers Detected a Supermassive Black Hole Feasting on “Rain” It’s Jaw-Dropping.

We hope you enjoy and check back for further updates.

thanks to sciencealert.com for the great info

thanks to NASA for the pic