> How long would it take for remnants of our civilization disappear if an apocalyptic meteor hit? Eons, the nuclear testing in the twentieth century left trace

> How long would it take for remnants of our civilization disappear if an apocalyptic meteor hit? Eons, the nuclear testing in the twentieth century left traces identifiable worldwide as I understand it, hence pre war steel and all that. We can confidently say we're the first nuclear civilization on this planet at least