Civilization Before Homo Sapiens?

[rangerrebew]

Civilization Before Homo Sapiens?
by Paul Gilster on April 18, 2018

My doctor is a long-time friend who always stops during my annual physical to ask about what’s going on in the hunt for exoplanets. Last week he surprised me when, after I had described ways of analyzing a transiting planet’s atmosphere, he asked whether planets could give rise to civilizations in different epochs. Why just one, in other words, given that homo sapiens has only been around for several hundred thousand years? Our technological civilization is a very recent, and to this point a short-lived phenomenon. Were there others?

https://www.centauri-dreams.org/2018/04/18/civilization-before-homo-sapiens/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+centauri-dreams%2Feepu+%28Centauri+Dreams%29