Primordial Black Hole
tiny, ancient superhero called Primordial Black Hole (PBH) that was formed over 13 billion years ago, at the dawn of our universe's creation, is like a small asteroid made of dark matter – we can't see it, but it's there, waiting to save the day!
Technical definition
A small region in space with such a strong gravity that nothing, not even light, can escape once it comes too close.