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I'm Dr. Universe, and if you're anything like me, you've got big questions about our world. I get lots of questions from kids wondering about aliens.

In this episode, we meet Afshin Khan, an astrobiologist who studied signs of life when she was a Ph.D. student at Washington State University. She shares her adventures to uncover the teeny, tiny life that forms framboidal pyrite on Earth -- and what it would mean if we found those structures outside Earth.

As always, submit your burning questions at askdruniverse.wsu.edu.  Who knows where your questions will take us next!

Learn more about astrobiology from scientists like Dr. Khan at Blue Marble Space Institute of Science.

Thanks to the amazing student actors at Regional Theatre of the Palouse.

 As always, submit burning questions at askdruniverse.wsu.edu.  Who knows where your questions will take us next.