Here's a good explnation (not mine, cause I don't have time to do all the math right now)<br /><br />"The theoretical resolving power of a telescope, measured in arc seconds, is calculated by dividing the aperture of the telescope (in inches) into 4.56. The largest telescope on Earth is the 10-meter Keck telescope in Hawaii. The theoretical resolving power of this telescope is 0.012", however the Earth's atmosphere limits the resolving power of any ground-based telescope to about 0.5"-1.0". The Hubble Space Telescope does not suffer from this limitation; thus, with an aperture of 94 inches, HST's resolving power is 0.05". At the Earth-Moon distance of 239,000 miles, the smallest object that can be resolved by HST is about 300 feet. The largest dimension of any hardware left behind on the Moon is 31 feet, which is the diagonal distance across the LM's footpads. No telescope, presently in existence, can see the Apollo hardware from Earth. "<br /><br />Hope this helps, Wayne<br /><br /> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>