ETs Exist- Renowned Scientists Say- On 'Aliens: The Definitive Guide'

The Milky Way galaxy is so big, that there's no doubt, statistically speaking, that ETs exist.

That's what several prominent scientists say on the month-long series "Are We Alone?," airing on the Science Channel.

But what do these otherworldly denizens look like? Are they smart or dumb? Will we ever come face to face with them?

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