Suppose that due to nuclear warfare or some deadly disease, the entire human population of earth died off in the near future. All humans gone, but most of life survived, including domesticated animals. Obviously the wildlife will soon take over and slowly the evidence of humanity will start to disappear.
How long would it take for all evidence to disappear? I'm talking including satellites, the ISS etc would have to either escape our orbit or more likely collapse back onto earth, all structures to be vanished, all human-made things to be vanished. I'm fine if structures deep underground or on ocean floors survived, but nothing visible on ground should remain, and even stuff that's underground if it's not too much underground.
How long would it take? Would it at all be possible before the sun dies off?
EDIT: Supplementary Info
This is what I'm mainly concerned about, in bullet form to highlight.
- How long would things like ISS and satellites take to collapse?
- Things that take a long time to decompose like plastic.
- Give it a few hundred million or even a billion years. Continents will have shifted, new mountains raised and the existing ones gone, would we still be able to see such long lasting creations of humanity?