We know that. But then Hollywood invented some crap about the aliens having been here before, to bury their Tonka toys. So, with respect to Hollywood's adaptation, we have to invent reasonably plausible storyline elements to accomodate the alterations.
I was quite happy with the original "space capsules lauched via Martian cannon fire" idea. I can understand that Hollywood wanted to modernise it, to bring it up to date, but the whole "they've been here before" element was completely unnecessary, and needlessly complicates things.
A.
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