Are We Alone In The Universe?

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Europa, one of Jupiter’s moons, seen from the unmanned Voyager 2 spacecraft in 1979. Heritage Space/Heritage Images/Getty Images

Heritage Space/Heritage Images/Getty Images

Are we alone in the universe?

It’s a question that’s been posed again and again. Carl Sagan posed it in the 1970s as a NASA mission scientist as the agency prepared to send its twin Viking landers to Mars.

And nearly 50 years after the first of two landers touched down on Mars, we’re no closer to an answer as to whether there’s life — out there.

Scientists haven’t stopped

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