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Mysterious structure in NASA's Mars photo sparks claims of a long-lost civilization

An image taken by Curiosity last month has sparked claims of a long-lost civilization on the Red Planet after some spotted a ...

80 million trees were wiped out in seconds in Siberia after a space rock explosion more powerful than the Hiroshima bomb, but scientists never found a crater

An explosion powerful enough to destroy millions of trees should have left behind a giant crater. Instead, when scientists ...