Episode Summary
Executive Summary: Star Talk’s Cosmic Queries episode spotlights JPL’s new director Laurie Leshin, covering her background, JPL’s dual Caltech/NASA structure, and the lab’s major mission portfolio. The discussion emphasizes Psyche’s delayed launch, Europa Clipper’s imminent assembly and 2024 launch, Mars Sample Return, planetary protection, propulsion advances, Artemis, and JPL’s growing role in Earth and exoplanet science.
Main Topics: Laurie Leshin’s role as JPL director: Leshin discusses her first months leading JPL, her Caltech ties, and the lab’s unusual structure as a Caltech-managed FFRDC funded by NASA. Near-term mission portfolio: The conversation centers on JPL’s current flagship missions: Psyche, Europa Clipper, Mars Sample Return, and recent Earth science work like SWOT. Europa and ocean-world exploration: Leshin explains Europa Clipper’s goals, how it will study the ice and ocean, why landing is difficult, and why Europa is a priority for life-detection science. Mars Sample Return and planetary protection: The hosts and Leshin discuss the challenge of bringing samples safely back from Mars and the strict containment requirements to avoid contamination. Propulsion and launch systems: The episode covers fusion’s long-term promise, current use of nuclear fission in deep-space missions, reusable vs expendable launch trade-offs, and future propulsion research. Future science priorities: asteroids, exoplanets, and Earth: Leshin highlights JPL work on asteroid resources, the Roman Space Telescope coronagraph for exoplanets, and Earth-observing missions addressing water, aerosols, and climate-related science. Human exploration and Artemis: The guests argue that robotic missions pave the way for humans, with Artemis framed as a step toward sustained human presence beyond Earth rather than symbolic flags-and-footprints exploration.
Key Arguments: JPL’s delayed Psyche launch was a prudent decision due to software issues and pandemic-related workflow disruptions; delaying is better than launching an unready spacecraft. Europa is a prime target because it may hide an ocean beneath kilometers of ice, making it one of the best places to search for life beyond Earth. Europa Clipper will not land but will perform multiple close flybys around Jupiter to measure ice thickness, ocean properties, and possible plume material. Mars Sample Return is scientifically important but requires rigorous planetary protection because returned material could pose contamination risks if not properly sealed. Fusion is a major breakthrough but remains far from practical spacecraft propulsion; current deep-space missions still rely on fission-based radioisotope power systems. Robotic missions are foundational for human exploration, as Ranger, Surveyor, and modern Mars missions help identify safe and scientifically valuable landing sites. JPL’s future is broader than planetary exploration: the lab is also driving Earth science, exoplanet imaging technology, and deep-space communications for Artemis. Reusable launch systems offer economic benefits, but expendable use can be preferable when maximizing payload performance is the mission priority.
Data Points: JPL director tenure at time of interview: Just over 6 months - Leshin describes being new in the role, shortly after taking over as director. Psyche launch window: October 2022 - Leshin says the mission was delayed from its original plan but would launch later that year. Europa Clipper launch: October 2024 - The first dedicated Europa mission is being assembled in JPL’s clean room for launch in 2024. Number of Europa Clipper sensors: 9 - Leshin says the spacecraft will carry nine sensors to study the ice shell and ocean beneath. Europa ice thickness: Many kilometers, probably tens of kilometers in places - Discussed as the main obstacle to reaching the ocean below. Jupiter distance from the Sun: 5 times farther than Earth - Used to explain why solar power is difficult at Europa/Jupiter missions. Solar intensity at Jupiter: 1/25th of Earth’s - Reason given for the enormous solar arrays needed for Europa Clipper. Mars Sample Return sample size: About the size of your pinky - Each sample tube holds a tiny rock core sealed in multiple containers. Age cited for human Mars question: 50 years old - A listener asked whether a human Mars landing is feasible within their lifetime. Voyager mission age: About 45 years (nearing 50) - Leshin references Voyager as the farthest human-made objects and still in contact with Earth.
Pivotal Quotes: "We're going to launch in October. It's not totally scratched. It's not canceled." — Laurie Leshin: On the delayed Psyche asteroid mission and its software-related postponement. "It’s about learning to really live on other worlds." — Laurie Leshin: On the larger purpose of Artemis and sustained human exploration beyond flags-and-footprints missions. "I want to go to Europa, dig through its service, and go ice fishing." — Neil deGrasse Tyson: A humorous reference to his cameo quote in The Europa Report while discussing Europa’s potential habitability.
Implications: The episode frames JPL as a key engine for near-term exploration, enabling Europe, Mars, and deep-space science while also advancing Earth monitoring and exoplanet imaging. It suggests the future of space is increasingly robotic, collaborative, and technology-driven, with human missions following where robots have already paved the way.