Looking for the city lights of alien civilizations

Artist's conception of city lights on an alien planet. Credit: David A. Aguilar (CfA)

When most people think about the search for alien life, the first thing that usually pops into mind is SETI (Search for Extraterrestrial Intelligence). Primarily a search for extraterrestrial radio signals, another more recent facet of SETI is now looking for laser pulses as a conceivable means of communication across interstellar distances. But now, a third option has been presented: looking for sources of artificial light on the surfaces of exoplanets, like the lights of cities on Earth…

See Universe Today for the full article.