Neil deGrasse Tyson – 'UFO' Doesn't Mean 'Aliens'

UFO sightings happen all the time – maybe even today! What would happen if top-secret UFO information leaked from the government? Neil deGrasse Tyson and co-host Harrison Greenbaum investigate the obvious pitfalls and enticing questions that come with UFO sightings. Plus, Neil sends his own message to any aliens out there listening.

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