Planck time matters because it marks the shortest moment our current physics can meaningfully describe. It’s not the “first tick of the universe” or the smallest possible slice of time. It’s the point beyond which our equations stop working reliably—and that’s interesting. Not just for exploring the first Planck after the Big Bang, but a Planck of time… now… and now.
This happens because our two most successful theories break in opposite ways at extreme scales. General relativity treats spacetime as smooth and continuous. Quantum physics treats reality as probabilistic and discrete. When we push either framework down to Planck-scale resolution, their assumptions collide. The math stops agreeing with itself—not because reality fails, but because our models do.
And that’s the fascinating part. We already know particle physics and relativity are incomplete. We even know where they fail. That breakdown has become a focal point for some of our greatest thinkers, who wonder whether it marks the path to a unified theory. Maybe it does. Maybe it doesn’t. It could be a red herring—an artifact of how we’ve built our tools. Or it could be the holy grail, pointing toward a deeper structure we haven’t yet learned how to describe.
Either way, Planck time isn’t telling us when the universe began. It’s telling us where our descriptions end. And knowing that boundary—clearly and honestly—isn’t a weakness of science. It’s one of its strengths.