>all constructions would have been turned to dust
I don't think that's true. There are detailed structured fossils and strata on Earth that are billions of years old, and our planet is geologically active with much more weather erosion.
I don't think that's true. There are detailed structured fossils and strata on Earth that are billions of years old, and our planet is geologically active with much more weather erosion.
Yes but that is not detectable from space, right? Also in Mars for example, without excavating specifically for fossils which I think hasn't been done yet, is there a way like certain geological structures that would remain intact after a billion years that would indicate life?