The galaxy cluster Abell 3376 is dropping electric arcs 3 million light-years across.
Simultaneously across a (very) wide front.
This is kind of difficult to explain using the traditional “waves of crashing gas” style of guesses, but fairly simple to explain with an electromagnetic universe, of which Abell 3376 would represent one single filamentry string from the bundle.
In plasma cosmology, it is the electric force that accelerates charged particles at energies up to 1020 electron volts.
You won’t see gravity doing that except maybe in a black hole or neutron star. That’s a bucketload of volts. (-: