A Self-Reproducing Interstellar Probe

R. A. Freitas Jr. (1980), JBIS, 33, pp.251-264

Refcode: 1980.33.251

Abstract:

THE FIRST SERIOUS PROPOSAL to use material space probes for interstellar exploration is properly credited to Bracewell. According to his calculations, if the Galaxy is heavily populated with extraterrestrial civilizations (~10 light-years average separation) then it makes sense to communicate using radio waves. If the Galaxy is only very thinly populated (~1000 light-years separation) communication is virtually impossible because of time lag and acquisition difficulties. However, if the Milky Way is populated at some intermediate level (~100 light-years separation) then the best way to explore and contact other races is by automated messenger probe.