“There is a limit on how much information you can keep bottled up.” -Dick Gregory
There are fundamental limits to the Universe, in the sense that there are scales where our laws of physics break down. You can’t break matter or energy up into infinitely small pieces, and the same goes — we think — for space and time. But is that necessarily all true, and is that what the Planck scale means? Not quite.
Rather, these are scales at which our laws of physics stop giving reliable predictions, as we make these mass, energy, length and time scales out of three constants fundamental to our physical theories: the gravitational constant, the speed of light and Planck’s constant. They do have strong physical implications, but they don’t necessarily mean these scales can’t be divisible further. After all, every particle in existence has a mass far below the Planck mass!