It’s one of those paradoxical statements that comic writers love to fall back on: What happens when the unstoppable force encounters the immovable object? I most recently saw it as part of the unanswerable riddle in All-Star Superman. But it’s often portrayed in terms of the Juggernaut vs. the Blob. I can’t recall in my own reading experience a time when these two have battled and it has stood out in my mind enough to have formed an opinion about, so I am honest when I claim to be pondering this subject anew.
It’s said that once the Juggernaut begins moving nothing can stop him. It’s also said that once the Blob decides to stay in one spot he cannot be moved. So I think it’s clear which character is each half of the equation. And I’m here to provide the solution. What happens when the unstoppable force encounters the immovable object? Nothing. Not a damn thing. The very question itself is logically flawed and therefore invalid and can never exist. I’d love this to be one of those moments when I say, “But wait! Here’s a crazy quantum/extra-dimensional work around!” but not today.
The idea of unstoppable forces and immovable objects are both from Aristotilian mechanics, and from a modern scientific viewpoint, they're both nonsense. You see, logically, the existence of an unstoppable force presumes that there are no immovable objects. Whereas conversely, the presence of an immovable object can only mean that there are no unstoppable forces. So if you have one you can’t have the other, let alone both colliding. So either comics are all fake, OR, one of them is lying about their powers! GASP! CONSPIRACY!
Fortunately, they’re both villains (at least some of the time) and likely prone to lying all too often, so how can we know who’s trying to pull the wool over our eyes? My gut reaction is to say Juggernaut, because his powers are magical and in the real world when someone claims to be magical they’re usually full of it or delusional. Just ask Houdini (who never claimed powers but loved to debunk frauds). However, this is the 616, and comics get to turn the tables on reality meaning magicks really do exist. Not only do they exist but they routinely break the rules of physics. As Tom Katers is oft willing to remind us “Superman is vulnerable to magic, which doesn’t count because EVERYONE is vulnerable to magic.”
The Blob claims no magic abilities, just the scientific ability to control his mono-directional gravity field (whatever the hell that means). Gravity doesn’t work in one direction, it works in all directions (sort of, but we're keeping it Newtonian for simplicity's sake). It’s the same error as saying heat rises. Heat does not rise folks, heat radiates outwards in all directions equally. Hotter fluids have the tendency to rise above cooler fluids (think lava lamp) so when you’re in an atmosphere hot air does tend to rise above cooler air, hence weather. I hope it’s at least starting to become clear that up and down, rise and fall, all start to lose meaning outside the bounds of earth. And speaking of the bounds of earth, my original point: gravity.