American astronomer and scientist who co-develops the hydrogen-powered radio transmitter to contact Mars. After global chaos ensues from the messages, he attempts to ignite the lab's hydrogen supply to kill Calder and stop a government cover-up, dying in the resulting blast.
Cronyn must comply with presidential directives regarding the Mars broadcasts.
Calder provided the foundational scientific framework for Cronyn's interplanetary research.
Explore the full interactive character relationship map of Red Planet Mars