5.2K views · 189 reactions | The presence of the substance of Xenon-129 on Mars, a product of nuclear weapon deployment, leaves scientists speculating whether aliens had engaged in a nuclear war on the planet. Watch more NASA's Unexplained Files on discovery+: https://bit.ly/38TZSzs | Love Space | Facebook
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5.2K views · 189 reactions | The presence of the substance of Xen…
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