Our guest is Dr. Caleb Scharf, the senior scientist for astrobiology at the NASA Ames Research Center! Dr. Scharf has conducted research in observational cosmology, exoplanetary science, and astrobiology. He is the author of multiple science and popular science books, and has won the Carl Sagan Medal for excellence in public communication of planetary science, as well as the 2011 Chambliss Astronomical Writing Award.

This program is an interactive talk show where our guest will answer questions from our host, Dr. Graham Lau, followed by your questions submitted via Twitter and YouTube. For more information, visit the official website of Ask An Astrobiologist.