#455 – Adam Frank: Alien Civilizations and the Search for Extraterrestrial Life

6917.387 - 6940.956 Adam Frank

And, you know, a species like us looking at our level, looking at Earth would have been able to know that Earth had life on it, had a biosphere for billions of years. So maybe somebody sent something by, you know, a half a billion years ago. So this idea of looking, say, at the moon for artifacts. is that have been there for a long time is something that people, a number of people are doing.