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Finding a sun that can be used as a space beacon is easy - but when that sun is orbited by inhabited planets, things can get sticky.
As it turns out, Scyth did have a plan for Earth involving a device called a barytrine field.
This idea is an obvious precursor to the opening scene in Douglas Adams' The Hitchhiker's Guide to the Galaxy; Scyth and his crew are a bit nicer than the Vogons who need to demolish Earth.
I also thought this item was interesting because I remember the debate that occurred when pulsars were discovered in 1967. A radio array discovered a very regular signal, consisting of pulses of radiation that recurred every few seconds. The astronomers who discovered it named it "LGM-1" for "little green men."
Everyone thought that the most obvious explanation was that they were signal beacons used by extraterrestrial civilizations. Ever wary of Occam's razor, however, scientists continued to search for a simpler, physical explanation.
Today, pulsars are believed to be rapidly rotating neutron stars with powerful magnetic fields; they emit radiation in the form of radio waves. These enormous objects have periods that range from 1.5 ms to 8.5 seconds. The radiation is focused along a very narrow beam along the poles of the magnetic field; dubbed the "lighthouse effect", pulsars emit radio waves so regularly that they are as accurate as an atomic clock.
George O. Smith was about fifteen years ahead in predicting that suns could be used as rapidly pulsating space beacons. With the right engineering, of course.
Compare to the hyperspace beacon from The Repairman (1959) by Harry Harrison. Also, distinguish from the space-beacon (in the sense of a landing signal) from Exploration Team, a 1956 story by Murray Leinster.
Also, see the seetee blinker from Collision Orbit (1941) by Jack Williamson and the Astroposit from The Hunch (1961) by Christopher Anvil.
The most technically complete reference is probably the Artificially Pulsating Star from The Cosmic Blinker (1951) by Eando Binder. Comment/Join this discussion ( 0 ) | RSS/XML | Blog This | Additional
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