“Despite being thin cylinders – similar in dimension to pencils – hundreds of millions of light years long, but just a few million light years in diameter, these fantastic tendrils of matter rotate,” added Noam Libeskind,
They can’t be EM if comprised of matter (but matter can generate EM) and if matter subject to principles of relativity?
Just curious
“They can’t be EM if comprised of matter”
It’s not just ordinary matter, it’s ionized plasma, which is inherently electromagnetic.