Washington: A team of astronomers, engineers, and physicists from the University of Hawaii, the University of Freiburg, and elsewhere has proposed a new and powerful technique to search for intelligent life.
Rather than looking for radio waves, the team suggests searching for the heat signatures of nearby planets, which requires a giant telescope that could detect infrared radiation directly from an exoplanet, thus revealing the presence of a civilization.
"The energy footprint of life and civilization appears as infrared heat radiation. A convenient way to describe the strength of this signal is in terms of total stellar power that is incident on the host planet," said Jeff R. Kuhn of the University of Hawaii`s Institute for Astronomy, the project`s lead scientist.
The technique arises from the fact that a civilization produces power that adds to the heat on a planet, beyond the heat received from its host star. A large enough telescope, idealized for infrared detection, could survey planets orbiting stars within 60 light-years of the Sun to see whether or not they host civilizations.
The quest for direct infrared detection of extraterrestrial civilizations, along with many other research possibilities, has led the team to the funding and building of a giant telescope. Currently planned large infrared telescopes, the Giant Magellan Telescope, the Thirty Meter Telescope, and the European Extremely Large Telescope, would not be large enough.
Instead, a telescope (dubbed Colossus) with a primary mirror about 250 feet (77 meters) in diameter could find hundreds of Earth-sized or larger planets in habitable zones, and perhaps dozens of extraterrestrial civilizations, by using a sensitive coronagraph-and the technology to build such an instrument exists.
The international team thus seeks funding to build a 77-m telescope, which would be constructed from revolutionary thin-mirror slumping and polishing technologies developed by the Innovative Optics team. The telescope would consist of approximately sixty 8-m mirror segments, and would operate at a high-altitude site.
Colossus`s field of view would be optimized for star-like sources. It would be the world`s best high-resolution infrared telescope and would excel at the study of stellar surfaces, black holes, and quasars, objects that appear smaller than 1 arcsecond on the sky.
The revolutionary method is described by four of the team`s astronomers in the June 2013 issue of Astronomy magazine, the world`s largest magazine on the subject, with a print and web readership of half a million each month.