Are We Alone In The Universe? : Consider This from NPR 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 looking. In fact, they've expanded their gaze to places like Saturn's largest moon, Titan and Jupiter's moon Europa.

The search for life beyond planet earth continues to captivate. And NASA has upcoming missions to both moons. Could we be closer to answering that question Carl Sagan asked some 50 years ago?

For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org.

Email us at considerthis@npr.org.

Are We Alone In The Universe?

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 hide caption

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Heritage Space/Heritage Images/Getty Images

Europa, one of Jupiter's moons, seen from the unmanned Voyager 2 spacecraft in 1979.

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 looking. In fact, they've expanded their gaze to places like Saturn's largest moon, Titan and Jupiter's moon Europa.

The search for life beyond planet earth continues to captivate. And NASA has upcoming missions to both moons. Could we be closer to answering that question Carl Sagan asked some 50 years ago?

For sponsor-free episodes of Consider This, sign up for Consider This+ via Apple Podcasts or at plus.npr.org.

Email us at considerthis@npr.org.

This episode was produced by Kai McNamee and Brianna Scott. It was edited by Christopher Intagliata. Our executive producer is Sami Yenigun.