Search for Extraterrestrial Intelligence (SETI) by fractal universe

Advancing the Search for Extraterrestrial Intelligence

The Search for Extraterrestrial Intelligence in Earth's Solar Transit Zone.

Over the past few years, astronomers have detected thousands of planets and candidate planets by observing their periodic transits in front of their host stars. A related method, called transit spectroscopy, might soon allow studies of the chemical imprints of life in extrasolar planetary atmospheres. Here, we address the reciprocal question, namely, from where is Earth detectable by extrasolar...

Alien Mindscapes—A Perspective on the Search for Extraterrestrial Intelligence

UNLABELLED Advances in planetary and space sciences, astrobiology, and life and cognitive sciences, combined with developments in communication theory, bioneural computing, machine learning, and big data analysis, create new opportunities to explore the probabilistic nature of alien life. Brought together in a multidisciplinary approach, they have the potential to support an integrated and expa...

Using Radio in the Search for Extraterrestrial Intelligence

Finding extraterrestrial intelligence would calibrate humanity’s place in the cosmos. It would also complete the so-called Copernican revolution. Beginning about 470 years ago, observation and scientific reasoning led to an accurate understanding of our place in the physical universe. The goal of SETI – the Search for Extraterrestrial Intelligence – is to learn our place in the intellectual uni...

Optical Search for Extraterrestrial Intelligence: A Spectroscopic Search for Laser Emission from Nearby Stars

We have searched for nonastrophysical emission lines in the optical spectra of 577 nearby F, G, K, and M main-sequence stars. Emission lines of astrophysical origin would also have been detected, such as from a time-variable chromosphere or infalling comets. We examined ∼20 spectra per star obtained during 4 years with the Keck/High Resolution Echelle Spectrometer at a resolution of 5 km s , wi...