Interstellar Societies: Possibility or Improbability? The future of interstellar travel may be the most important factor when considering SETI strategy. Are societies spanning entire galaxies, with billions of inhabited worlds, likely to exist? Are they even possible? Two
oumuamua Life in Elliptical Galaxies What happens on galactic scales seems far removed from life on Earth. Galactic habitability is the idea that the cosmic environment of a planet can influence — or inhibit — its life. Studies about galactic
Searching for ET with X-ray Lenses In SETI, brighter is better: the more powerful a signal is, the further away we could detect it. Maybe aliens use huge power plants to keep a beacon going in hopes of grabbing
Mirror in the Sky An old technology is the key to a new method in the search for extraterrestrial intelligence. The simple mirror can act as a powerful beacon when it is reflecting direct sunlight. Unlike the
Can you shroud a galaxy? In 1964, Nikolai Kardashev proposed three levels of alien societies: Type I societies use the energy equivalent to all of the starlight falling on their planet, Type II societies the energy of an