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Where to watch "NASA's Unexplained Files"
6. Did Aliens Nuke Mars?
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A strange discovery by NASA's Mars Curiosity rover suggests the Red Planet was home to an alien nuclear war 300 million years ago – could this be true?
2. The Black Hole Next Door
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When astronomers discover a rogue black hole speeding through the Milky Way, they investigate how much danger this cosmic monster poses to Earth, and what would happen if it ever entered our solar system.
