The scariest thing few will ever encounter, currently isn't even the size of a marble. Just a couple millenia ago, it wasn't even the size of a pea. It's a stationary point in existence that deletes literally anything, even space and time.
The way it works, if simplified to an extreme degree, is that the areas it passes through is cut out of existence and the parts that remain are stretched and glued back together. It itself can only be quantified as the absence of anything, and it's been growing.
The issue is, even though it itself is stationary, everything else is moving. Take Earth for example. It's moving at a decent speed of 30 km/s and rotating at a speed of 400 m/s.