Scientists don't know what happened before the universe was one Planck unit in size. A Planck unit is the smallest possible unit of length, time, mass, and energy. We can't see or measure anything smaller than a Planck unit, so we don't know what happened before then.

Some scientists think the universe started with a big explosion called the Big Bang. Others think the universe has always existed and is constantly expanding. There are also scientists who think there are many universes, and our universe is just one of them.

We don't know for sure what happened before the universe was one Planck unit in size. But it's fun to think about all the possibilities!
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