Wave 'ripples' found on Mars prove it once had flowing liquid water, not just ice New research reveals ancient ripples on Mars, providing compelling evidence of long-lost lakes that once existed 3.7 billion years ago.

Wave ‘ripples’ found on Mars prove it once had flowing liquid water, not just ice: New research reveals ancient ripples on Mars, providing compelling evidence of long-lost lakes that once existed 3.7 billion years ago.

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