Tagged: extraterrestrial civilization

Upcoming telescopes will give us more power to search for biosignatures on all the exoplanets we’ve found. Much of the biosignature conversation is centered on biogenic chemistry, such as atmospheric gases produced by simple, single-celled creatures. But what if we want to search for technological...

Ellen Lloyd  – In the year 774 A.D, people witnessed something strange in the skies over Britain. An old English text reveals a “red crucifix” was visible in the sky when Mercians were fighting men from Kent. At the time, people could only explain this...