The idea that an advanced civilization existed on Earth long before humans is fascinating, but scientists aren't convinced. Experts have explored this possibility by asking what traces a technological ...
Add Yahoo as a preferred source to see more of our stories on Google. The fossilized tail bones of an Ichthyosaurus, around 190 million years old and weighing 800 kilograms. - Markus Scholz/picture ...
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Light from the Andromeda galaxy left home before modern humans appeared and only now reaches Earth
Andromeda is the nearest major galaxy to the Milky Way, yet every view of it is ancient. The light reaching Earth tonight ...
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