Forward also published the first paper showing that it was possible to build and operate a laser interferometer gravitational radiation antenna that was photon noise limited over the band from 1-20 kHz, and that further improvements in gravitational strain sensitivity needed only more laser power and longer lengths in the interferometer arms. The broadband gravitational strain sensitivity his laser interferometer antenna reached in 1972 was not bettered for over a decade. Forward also invented the multidirectional spherical bar antenna for gravitational radiation, and the rotating cruciform gravity gradiometer Mass Detector for Lunar Mascon measurements (which Misner, Wheeler & Thorne pointed out can detect the curvature of spacetime produced by a fist).
From the time of his retirement from Hughes in 1987 onward, Forward was a consultant for the Air Force and NASA on advanced space propulsion concepts, with an emphasis on propulsion methods (lightsail, antimatter, electrodynamic tether, etc.), that use physical principles other than chemical or nuclear rockets. In 1992 he formed the company, Tethers Unlimited, with Dr. Robert P. Hoyt. When he reached 70 he "retired" to part time consulting and writing.
In addition to over 200 papers and articles, Forward published 11 "hard" science fiction novels, where the science is as accurate as possible-consistent with telling a good story. Forward "taught" science through his novels. His first book, DRAGON'S EGG, expanded upon Frank Drake's idea of tiny fast-living creatures living on the surface of a neutron star. Forward called it, "A textbook on neutron star physics disguised as a novel." The book is often assigned as "extra credit reading" in beginning astronomy courses. The science in his books has often been novel enough that many of his fiction books have been referenced in journal publications as "prior art publications". Downloads of many of Forward's papers can be obtained by visiting his web site at www.robertforward.com/index.htm