pgchelsea asked: "Isn't a telescope in space better than a telescope on the moon?"<br /><br />A telescope in space, like Hubble which is in Low Earth Orbit, is limited in the amount of time it has to observe a specific object, since, every 90 minutes it completes one revolution around the Earth. Any one object would be visible from Hubble's vantage point for only 45 minutes tops. On the Moon, there would be a two week window that a telescope could point at an object. Also, on the moon, there is sufficent room to build many large telescopes, and link them together to operate as one super-large telescope. The Moon also offers a very stable platform for radio astronomy, especially on the far side (the hemisphere that always faces away from Earth) since it would shield the radio telescope from Earth's radio background noise.<br /><br />