Big News All Around the Solar System From Emily Lakdawalla

Episode Summary

Executive Summary: This Planetary Radio episode surveys highlights from the 2012 Lunar and Planetary Science Conference, focusing on new discoveries from Mercury, Titan, Vesta, Mars, and the Moon. The show also covers planetary-science budget pressures, reuse of Shuttle-era infrastructure, and Bruce Betts’ skywatching and trivia segment.

Main Topics: LPSC 2012: major planetary science news roundup: Bill Nye and Emily Lachtawala describe the conference as a busy, high-energy meeting where new results across the solar system were shared, from Mercury to the Moon. Mercury discoveries from MESSENGER: Emily details MESSENGER/MLA findings showing Caloris’ topography is more subtle than expected, Mercury’s crust has widespread long-wavelength folds and thrust belts, and the planet likely has a complex interior and polar ice/organics deposits. Titan’s internal ocean and seasonal changes: Cassini data reveal Titan’s changing weather and support the conclusion that Titan has an internal liquid-water ocean beneath its methane-rich surface. Vesta, Mars, Phobos, Deimos, and GRAIL results: Dawn observations at Vesta show extreme slopes and hydrogen-rich ejecta; Opportunity studies at Endeavour Crater confirm impact breccias; Phobos/Deimos composition and groove theories are debated; GRAIL quickly improves lunar gravity mapping and earns mission extension funding. Budget politics and future mission priorities: Bill Nye and conference speakers discuss the impact of a $309 million annual planetary-science cut and argue against robbing other programs such as JWST or commercial crew to cover it. Reuse of Shuttle infrastructure for future launches: The discussion highlights SpaceX and ULA interest in using the old Shuttle launch pad and VAB, presented as a practical and symbolic way to repurpose Apollo/Shuttle-era hardware. Skywatching and space trivia with Bruce Betts: Bruce covers Venus, Jupiter, Mars, and Saturn in the evening sky, notes anniversaries of Pallas and Vesta discoveries, and quizzes listeners on Opportunity’s location and Jupiter’s fifth-most-massive moon.

Key Arguments: MESSENGER’s Mercury results show the planet is geologically and internally more complex than older models suggested, with evidence for crustal shortening, a dense interior, and polar cold traps holding ice and organics. Titan likely has a subsurface liquid-water ocean, inferred from gravity/Doppler tracking, demonstrating that detailed interior structure can be recovered without a dedicated orbiter at every target. Dawn’s observations indicate Vesta is far more rugged than typical bodies, with extreme slopes and impact-related geology that complicate crater shapes and surface evolution. Planetary science budgets are too small to absorb cuts without damaging flagship missions; the speakers argue that shifting money from JWST or commercial crew is not a viable solution. Reusing Shuttle infrastructure for new launch providers is portrayed as cost-effective and beneficial because it adapts existing high-value hardware for future missions. Opportunity remained healthy enough to continue south from Cape York, but dusty solar arrays raised concern about surviving the next Martian winter without a cleaning event.

Data Points: Annual planetary science cut: $309 million - Bill Nye discusses the stress caused by proposed budget reductions over the next five or six years. Curiosity rover landing: August - Referenced as an example of a major mission that would be harder to sustain under current cuts. Space Launch System launch cadence: 2017 and 2021 - Bill Nye notes the planned rocket schedule and jokes that four years between launches could doom it politically. VAB height: 500 feet - Bill Nye describes the Vertical Assembly Building as a massive structure taller than or nearly as tall as the Washington Monument. Mercury polar radar finding year: 1991 - Emily cites Arecibo radar observations that first strongly suggested polar deposits on Mercury. Titan gravity/orbit inference: Internal ocean confirmed - Cassini’s tracking data support a liquid-water layer beneath Titan’s surface. Vesta slope steepness: 40 degrees - Dawn scientists report exceptionally steep topography on Vesta. Vesta hydrogen abundance: about 400 parts per million - Hydrogen is concentrated in ejecta from Vesta’s giant southern impact basin. LPSC note-taking load: 20,000 words - Emily says she took roughly 20,000 words of notes during the conference. GRAIL data duration: 15 days - Maria Zuber presented early gravity results from only two weeks of data. Planetary Society membership: nearly 100,000 members - Mentioned in the promotional membership spot. Asteroid discovery anniversaries: 210 years and 205 years - Bruce Betts marks Heinrich Olbers’ discoveries of Pallas and Vesta.

Pivotal Quotes: "It's just a party of geologists who study other worlds." — Bill Nye: Opening description of the Lunar and Planetary Science Conference atmosphere. "It makes our planetary neighborhood even more astounding." — Matt Kaplan: Introductory framing of Emily Lachtawala’s conference report. "At Mercury's poles, you've got ice, you've got organic material... So, hey, let's settle Mercury." — Emily Lochtawala: Discussion of polar cold traps and the surprising habitability implications of Mercury’s poles.

Implications: The episode underscores how rapidly planetary science is advancing despite budget pressure, with new missions reshaping ideas about habitability, geology, and solar-system history. It also points to a future built on smarter mission reuse, better gravity/remote-sensing techniques, and continued public engagement.