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Quite, which in my view makes any prior technological civilization on Earth unlikely, as there is no evidence. One of things I remember most about the programme was the speculation around what future archaeologists would make of out of town shopping malls. Would they think them to be sites of...

There was a documentary on C4 (I think it was called Life After People) some years ago that asked the question about how long evidence of our current civilization would be detectable. As I recall, I think the last traces would be things along the lines of Mount Rushmore. What was surprising...

From Wikipedia: On November 4, 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarf stars within the Milky Way galaxy. 11 billion of these estimated planets...

I think you mean 500 million years. Makes a bit of a difference.