I'm not sure if this planet has ever been 'visited' by peoples from another world. However, it has been here for over 4 billion years and although we have only been broadcasting using radio waves for the past hundred or so, an advanced alien species would only have to take look at the composition of our atmosphere to 'mark' this planet out as something interesting to investigate.
As far as the ancient astronaut theory put forward by the likes of Von Daniken, well, he's just nuts isn't he? If aliens did visit us during our early years of civilisation then they certainly didn't leave any convincing evidence. However, that doesn't mean they didn't pay the odd visit.
As far as the ancient astronaut theory put forward by the likes of Von Daniken, well, he's just nuts isn't he? If aliens did visit us during our early years of civilisation then they certainly didn't leave any convincing evidence. However, that doesn't mean they didn't pay the odd visit.
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