NASA's Perseverance Rover is on Mars carrying out a mission no other spacecraft has ever been capable of.  

It is looking for and collecting samples of soil and rock that might contain evidence that life, at least microbial life, perhaps once existed on the Red Planet. 

And if it's found, the singular question humankind has pondered for centuries...​are we alone?

CGTN's John Zarrella spoke with Franklin Chang-Diaz and Leroy Chiao are former NASA space shuttle astronauts about the finally answer.  

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