Wandering Black Hole
The most of us are at least vaguely familiar with what a black hole is. It's a large spacehole that is so strong that not even light can get through it. It seems risky, but in a far-off, unimportant sense. Things start to become a little eerie when you learn about wandering black holes, which actually roam through space.
The Earth and everything on it would perish if a wandering black hole entered our solar system. because everything on earth and the earth itself would vanish. In 2020, thirteen wandering black holes were discovered, albeit "not far" in the context of space refers to a distance of one billion light years, so don't say goodbye to your cat just yet.
We're probably all safe for the time being because the likelihood of a catastrophe like this consuming our planet plays out over eons. And if you're concerned that humans could create black holes like those predicted by the Large Hadron Collider, you shouldn't be. They're not harmful.