
What was the planet Mars like in the past? Was it a dry desolate world like the one we see today, or was it a watery oasis filled with oceans, lakes, and rushing rivers? Was it Earthlike? Dean Regas chats with University of Cincinnati Professor of Geosciences, and NASA Advisory Board Member, Dr. Andy Czaja, to find out more.
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Is most of the universe actually invisible? (with Dr. Stacy McGaugh)

3000 Astronomers, One Thrilling Event

FROM THE ARCHIVE: Can Elon Musk Even Go to Mars? (with Oliver Morton)

FROM THE ARCHIVE: Problem Solving in Space (with Andy Weir)
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