We've recently discovered that giant planets roam our galaxy on their own, in darkness, without any parent star. And now it seems that these rogue planets also make planets of their own.

Call them planet-planets? Mega-moons? It's weird and exciting out there!

https://news.st-andrews.ac.uk/archive/giant-free-floating-planets-may-form-their-own-planetary-systems/ #space #science #nature