Kevin Hardegree Ullman, Aubree Sweeney and the cosmic piano tuning.

Episode Zero and the kid who cried asteroid.

Andy Weir and the eco-friendly time machine.

David Politzer and the string theory of banjos.

James Tuttle Keane and the sketch of the farthest snowman.

Sumner Norman and the mind-reading robots.

Mark Mammone and the alternate universe.

Robert Picardo, Konstantin Batygin and the factor of two hypothesis.

Avery Broderick and the first black hole selfie.

Robert Zubrin and the astronauts' direct advice.