What will be our ultimate limit in seeing distant objects clearly?

At One Micro Arc Second, the disks of planets like Jupiter would be resolvable as far away as 3000 light years. Earth-sized planets orbiting nearby stars would be discerned as clearly as we see Jupiter with a 6" telescope. The motions of distant galaxies would be detectable in a single human lifetime, as would the motions of individual stars in nearby galaxies.

At One Nano Arc Second, the surfaces of planets orbiting Alpha Centauri are seen as clearly as Magellan now shows us Venus. We begin to resolve planets like Jupiter within the Andromeda galaxy, and the surface markings on individual red giant stars out to the Virgo Cluster. The motions of distant quasars would be discerned within a few years. Beyond this limit the mind reels at even more stupendous possibilities. Unfortunately, the laws of physics present us with three formidable obstacles to overcome in making these possibilities a scientific reality: High resolution necessarily means having to build large costly instruments; Not all surface details are bright enough to be seen at every conceivable, wavelength, distance and resolution; and finally, since everything in the universe is motion, we have only a limited amount of time to form a sharp image before the objects move and cause image blurring.