Ancient ‘technological species’ may have lived on Earth before humans

An earlier indigenous technological species could have originated on ancient Earth or on some other body, such as pre-global warming Venus or ancient Mars. The researcher notes that on Earth, erosion and plate tectonics may have erased any evidence if such – ancient alien – species ever lived on our planet millions or perhaps billions of years ago. Alien technosignatures can be expected to be extremely old, limiting the places where they can still be found to beneath the surfaces of Mars and the Moon, or in the outer solar system. One of the most frequently asked questions on planet Earth is without a doubt: are we the…