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If we could see radio frequencies, the picture on the left might be what a radio galaxy would look like, a normal four armed galaxy at the time of a burst of energy from the center outwards along the axis.
We've added a few lines to the picture on the right. Does it look familiar? Go back to the picture of the disk generator sitting on the table where we had a spinning metal disk inside a magnetic field creating an electric current. Now multiply the size of the disk by a billion three times, and that gets it up to the size of a galaxy, a spinning disk in the middle of a gigantic magnetic field set up by all those other galaxy magnets.
Radio galaxies generate electricity because they are disk generators rotating in a magnetic field.
WHAT'S A QUASAR
The word quasar means like a star, quasi-stellar, but the object is nothing like a star. We called it a quasar only because it's so bright but too small to be a galaxy. Galaxies are about one hundred thousand light-years across. Quasars are only about one light-year across, and yet they send out ten thousand times more energy than a galaxy with billions of stars.
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