Fire and Ice With Volcanologist Rosaly Lopes

Episode Summary

Executive Summary: This Planetary Radio episode mixes updates on Pluto’s newly discovered fifth moon with a wide-ranging conversation about volcanism in the solar system. Emily Lakdawalla explains how the discovery could affect New Horizons science and spacecraft safety. Bill Nye previews PlanetFest and climate comparisons, while Rosalie Lopez discusses Earth, Io, Venus, Enceladus, Titan, Mars, Europa, and the search for life through volcanism and cryovolcanism.

Main Topics: Pluto’s fifth moon and New Horizons planning: Emily Lakdawalla explains that Pluto now has at least five moons, raising questions about whether more moons or ring material exist and whether New Horizons’ planned flyby trajectory needs re-evaluation for safety. Climate comparison and planetary habitability: Bill Nye discusses the comparative climatology conference, contrasting Venus, Mars, and Earth to frame why Earth’s climate is uniquely habitable but threatened by warming and acidification. PlanetFest and Curiosity landing preparations: Bill Nye promotes PlanetFest 2012 in Pasadena and its webcast, emphasizing live coverage, Curiosity mission experts, and public participation in the Mars landing celebration. Rosalie Lopez’s career and volcanology expertise: Lopez’s background, awards, and role in planetary nomenclature are highlighted, including her distinction as a major discoverer of volcanoes and her work on Earth and extraterrestrial volcanism. Volcanism beyond Earth: Io, Venus, Mars, Titan, Enceladus: Lopez explains how tidal heating, atmospheric conditions, and icy crusts create volcanic or cryovolcanic activity on multiple worlds, with Io and Enceladus as especially important examples. Europa, life potential, and future missions: The conversation turns to Europa as a prime target because it combines liquid water and internal heat; Lopez argues a mission there should be a priority for astrobiology and future exploration. Night-sky update and space trivia: Bruce Betts closes with observing tips, historical notes, a celebrity space fact from Andre Bormanis, and a listener trivia contest tied to the Sun’s galactic orbit and ISS crew identification.

Key Arguments: Pluto’s newly found moon suggests the system may be larger and more complex than previously thought, possibly including additional moons or ring material. New Horizons may need a trajectory review because unseen particles or ringlets around Pluto could pose a collision hazard to the spacecraft. Comparative climatology shows Earth is habitable in a narrow range, while Venus is too hot and Mars too dry and radiation-blasted. Volcanism is central to planetary evolution and habitability because it supplies heat and shapes atmospheres and surfaces. Io’s volcanism is explained by tidal flexing from Jupiter and neighboring moons, making it the most active volcanic body known. Cryovolcanism on moons like Enceladus and Titan follows the same basic geologic principle as rock volcanism but involves water, ammonia, or methane in cold environments. Europa is likely one of the best places to search for life because it may have liquid water beneath an icy crust plus internal heating. Titan may be more Earth-like than Mars in terms of active surface processes because it has an atmosphere, wind, dunes, methane rain, and possibly cryovolcanic features.

Data Points: Pluto moons: 5 known moons - Emily Lakdawalla notes Pluto has one large moon, Charon, plus at least four smaller moons, including newly discovered P5 Small moons around Pluto: At least 4 - Hydra, Nix, P4, and P5 are discussed as Pluto’s smaller satellites New Horizons science window: Limited detailed observations of the new moon - The team will likely prioritize larger bodies and may only do one thorough small-moon characterization Pluto flyby safety concern: Collision risk from particles/ring material - Lakdawalla says even a single impact could end the mission Rosalie Lopez’s Io discoveries: 71 active volcanoes - She is described as having found 71 active volcanoes on Io Earth volcanoes visited: About 50–60 - Lopez estimates she has visited between 50 and 60 active volcanoes on Earth Tvashtar plume height: About 50 kilometers - Lopez describes a powerful eruption plume observed on Io Cassini mission timeline: Mission extended to 2017 - The conversation references the Cassini solstice mission continuing until 2017 Saturn seasonal cycle: One full orbit around the Sun - Cassini has been at Saturn long enough to observe an entire seasonal cycle through equinox and toward solstice PlanetFest dates: August 4–5, 2012 - Bill Nye promotes the Pasadena event and webcast Comparative climatology video length: 2 hours 42 minutes - Bill Nye says the conference proceedings are available online Solar orbit trivia answer: About 20 galactic orbits - The Sun has completed roughly 20 trips around the Milky Way’s center since its formation Galactic year length: 225–250 million years - Bruce Betts gives the approximate time for one orbit around the galactic center ISS crew count at time of show: 3 on station, 3 en route - The trivia challenge asks listeners to name Expedition 32 crew members Speaker contact deadline: July 23 at 2 p.m. Pacific - Deadline for the ISS trivia contest entry

Pivotal Quotes: "You don't want to be Venus." — Bill Nye: Bill contrasts climates at the Comparative Climatology Conference "Titan is... the most Earth-like." — Rosalie Lopez: Lopez argues Titan resembles Earth more than Mars because of its atmosphere, weather, dunes, and liquid cycles "volcanoes provide the heat that we need for life as we know it." — Rosalie Lopez: Lopez explains why volcanism matters in the search for life on icy moons

Implications: Listeners come away with a stronger sense that small discoveries can alter mission planning, and that volcanism—rock or cryo—is key to understanding planetary evolution and habitability. Europa, Enceladus, and Titan remain high-value targets for future exploration.