Digging Deep With Kris Zacny and the Planetary Deep Drill

Episode Summary

Executive Summary: The episode centers on three linked space-exploration themes: ESA’s high-stakes Philae comet landing, Bill Nye’s case for science literacy and evolution education, and Honeybee Robotics’ Planetary Deep Drill, a wireline system aimed at reaching deep subsurface ice on Mars and icy worlds. Bruce Betts closes with skywatching notes, Mars history, and a trivia contest.

Main Topics: Philae’s historic comet landing: Emily Lakdawalla reports from Darmstadt on ESA’s imminent attempt to land Philae on comet 67P/Churyumov-Gerasimenko, emphasizing the mission’s novelty, risk, landing-site constraints, and the quick turnaround expected for confirmation of success or failure. Bill Nye on evolution and science literacy: Nye discusses his book Undeniable, arguing that basic evolution knowledge is essential for scientifically literate citizens and that understanding life’s origins matters for Earth and possible life elsewhere. Planetary Deep Drill technology: Chris Zackney explains Honeybee Robotics’ approach to deep subsurface drilling on Mars and icy worlds, replacing heavy drill pipe with a tethered, powered system designed to reach much greater depths with low power. Engineering constraints for drilling beyond Earth: The conversation compares melt probes, RTGs, nuclear reactors, and mechanical augers, concluding that a low-power mechanical drill is the most practical path for deep extraterrestrial ice access. Bruce Betts’ sky and mission roundup: Betts offers observing tips, notes Apollo 12 and Mariner 9 anniversaries, explains Mariner 9’s transformative Mars findings, and runs the weekly trivia contest with a telescope-network prize. Planetary Society advocacy and outreach: Short promos highlight the Society’s grassroots space-advocacy effort and the Random Space Fact video series, reinforcing the show’s public-engagement mission.

Key Arguments: Landing on a comet is unprecedented, so Philae’s descent is scientifically exciting but operationally very risky. ESA increased public understanding by packaging the Rosetta/Philae mission through cartoons, timelines, blogging, and social media. Nye argues that evolution basics should be common knowledge for citizens because science literacy supports exploration, technology, and informed public debate. Claims about a young Earth conflict with physics because light-speed limits make it impossible for distant starlight to arrive in only thousands of years. To understand planetary history, scientists must go beneath the surface; surface observations alone reveal only a small part of a world’s story. Melt probes are power-hungry and impractical for small robotic missions, while a mechanically driven drill can operate around 100 watts. Honeybee’s tethered deep drill avoids carrying long drill pipes by suspending the drill on a wire that transmits power and data. Periodic extraction of cuttings can preserve stratigraphy while enabling in-situ analysis and even microscopic inspection of borehole material. Field testing in a gypsum quarry is a necessary step to prove robustness before NASA would consider flight adoption. Mariner 9 demonstrated how a Mars orbiter can overturn assumptions by revealing volcanoes and Valles Marineris after earlier flybys suggested a more lunar-like planet.

Data Points: Landing timing: early Wednesday morning - Philae’s planned touchdown on comet 67P Landing novelty: first attempted landing on a comet - Why Philae’s mission is historic Landing site: smaller end of the comet - Chosen touchdown area described as relatively flat but still hazardous Curiosity drill depth: approximately 5–6 centimeters - Existing Mars drilling capability discussed by Chris Zackney Melt-probe power: 10–20 kilowatts - Estimated power needed to melt through ice System power allowance: 30–40 kilowatts - Including inefficiencies for melt-probe concepts RTG output: 100 watts each - Comparison showing why radioisotope generators are insufficient for melt probes Deep drill power target: 100 watts - Approximate operating power for the mechanical planetary deep drill RTG count estimate: 2–3 RTGs - Estimated to support the deep drill plus computing needs Drill extraction rate: 2–4 meters per second - Speed at which the drill can be withdrawn to dump cuttings Prototype test depth: 100 feet below the surface - Planned gypsum quarry field test near the Salton Sea Microscope resolution: half a micron - Scaled-down microscope intended to inspect borehole particles Apollo 12 launch year: 1969 - This week in space history Mariner 9 Mars-orbiter year: 1971 - This week in space history Exoplanet discovery range: within 1,000 light years - Where most exoplanets are discovered relative to Earth Milky Way width: 100,000 light years - Bruce Betts’ comparison for exoplanet discovery distribution Contest deadline: November 18 at 8 a.m. Pacific time - Deadline for answering the weekly trivia question Prize value: 200 points / $200 US - iTelescope.net prize for the contest winner

Pivotal Quotes: "we've never attempted landing on a comet before, so it's a big deal and it's very scary." — Emily Lakdawalla: Describing the significance and risk of Philae’s landing "If you want to learn about the history of Earth, you have to drill down" — Chris Zackney: Explaining the core rationale for deep subsurface drilling "we need to raise a generation of scientifically literate kids so that they can change the world" — Bill Nye: Making the case for science education and evolution literacy

Implications: The episode frames future planetary science as a combination of bold exploration, better public science literacy, and enabling technology. Deep subsurface drilling could unlock buried water ice, geology, and possibly biosignatures on Mars and icy moons.