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You're quite right! The diameter of the known universe is about 10^26 metres; Planck length is about 10^(-35) metres. However, Planck length is a theoretical construct only. The smallest measurement so far made (at the LHC) is about 10^(-18)m. On the other hand, the Universe is not only expanding but accelerating, and depending on the precise values of Hubble's constant and the Cosmological constant; which are currently unknown, may yet increase by many orders of magnitude.
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