Was there a civilization on Earth before humans?

Re:Was there a civilization on Earth before humans? by koboll on Saturday April 14, 2018 @11:37AM (#16837757)

Does LIDAR penetrate dust? I wonder what we might find if we scanned the entire Moon...

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Re:Was there a civilization on Earth before humans? by c22 on Saturday April 14, 2018 @01:12PM (#16838250)

We have LIDAR scans of most of the moon.

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Re:Was there a civilization on Earth before humans? by ryl00 on Saturday April 14, 2018 @02:58PM (#16838843)

Maybe a monolith? ;)

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