That’s because dark clouds of dust and gas obscure our view from Earth. Even with advanced X-ray and radio telescopes, we’re still uncovering new surprises in our cosmic backyard.
They could also possibly be linked to radio-emitting bubbles that sit at the Milky Way’s center.
“We still don’t know why they come in clusters or understand how they separate, and we don’t know how these regular spacings happen. Every time we answer one question, multiple other questions arise.”