Lisa Kaltenegger is the Director of the Carl Sagan Institute at Cornell and works from Sagan's old office. In this episode of The Space Show, she reveals how we may be just a few years away from answering humanity's greatest question: are we alone in the universe? Watch more from this series: ...

Panspermia is a theory that life can spread naturally between planets. Amir Siraj studies how life on Earth might have first arrived from another world. He is the youngest person included in this year's Forbes 30 Under 30 list of scientists, and is a student at Harvard University and the New ...