A dark matter halo with a galaxy at its heart. It's possible, however, that not all dark matter haloes could packed with stellar fillings. | Credit: Robert Lea (created with Canva) For some time ...

Indications that the great stellar systems in space may possess outlying sparsely populated star "haloes" extending the system for beyond the size astronomers have generally assigned to them were ...

But new research flips this question around, investigating whether some dark matter haloes could exist without galaxies in their centers — like hollow Easter Eggs roaming the cosmos. Galaxies ...