Not true, but you still need a pretty big one. In order to resolve a 50cm object 238k miles away (average Moon distance) at visible light wavelengths you need a telescope with a diameter of 500 meters. In order to resolve some details on such object, say have 10 distinct pixels on it, you need 10 times as much. Since resolving power only depends on the distance between the two extreme viewpoints, you could get away with two separate telescopes separated by 5km. But optical interferometry is extremely hard and, to this day, not very successfull.