The resolution of radio observations is proportional to the diameter of the radio dish. Radio astronomers have extended the diameters of radio telescopes through interferometry where multiple dishes, possibly on different continents, effectively create a single receiver with a very long baseline. This article explores a way of extending this technique even farther by placing radio receivers in Earth orbit or on the Moon, dramatically enlarging the effective size of the radio telescope.

http://www.raa-journal.org/raa/index.php/raa/article/view/1676