746K views · 1.7K reactions | Humanity’s greatest explorers aren’t always human. Join us as we celebrate the achievements of the Mars Exploration Rovers Opportunity at the completion of a 15 year mission: https://go.nasa.gov/2SxMkjK | NASA Jet Propulsion Laboratory | Facebook

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