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It is true that the Hubble Space Telescope can see things very clearly - one can argue that it provides the clearest view of the sky in visible light "colors" that humans have ever had. However, its capabilities are still limited by the laws of physics.
For a telescope with a circular collecting area of diameter D (2.4 m for
Hubble), the smallest feature that one can resolve at wavelength L
(550 x 10^-9 m for visible light) is given roughly by:
resolution = 1.4 L/D = 3.2 x 10^-7 radians
This estimate gives the "diffraction limited" resolution, or the resolution based on light's wave-like characteristics. It is difficult to improve upon this limit.
The distance to the Moon is roughly 240,000 miles. Hubble's resolution
corresponds to a physical dimension of size = x = 0.08 miles = 405 feet = 124 meters at the Moon's surface ... roughly the size of a football field.
This is quite a bit larger than any of the artifacts you would want to see on the lunar surface, so even Hubble's tremendous clarity is not enough for what you would like to do! If we had an aircraft carrier at the lunar surface, then Hubble could probably get a pretty good look at it.