In order to see objects that humans left on the moon, you'd need a telescope 50x larger than The Hubble!

Hubble's orbit outside the distortion of Earth's atmosphere allows it to take extremely high-resolution images with almost no backgroundlight. Hubble's Deep Field has recorded some of the most detailed visible-light images ever, allowing a deep view into space and time.The Hubble Space Telescope (HST) is a space telescope that was carried into orbit by a Space Shuttle in 1990 and remains in operation. A 2.4-meter (7.9 ft) aperture telescope in low Earth orbit, Hubble's four main instruments observe in the near ultraviolet, visible, and near infrared.

You will need a telescope 50 times the size of the Hubble to see objects left by humans on the moon. Even if we use the Hubble Space Telescope to look at the moon, a football stadium sized object would appear as only one pixel.

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