Look out for giant triangles in space

April 12, 2005 | Source: NewScientist.com News

The search for extraterrestrial intelligence (SETI) should look for giant structures placed in orbit around nearby stars by alien civilizations, says Luc Arnold of the Observatory of Haute-Provence in France.

And he believes that the generation of space-based telescopes now being designed will be able to spot them.

To ensure the signal is unambiguous, an alien civilization would have to launch a number of objects into orbit around a star, such as objects in groups of one, two, three and five — the first prime numbers.