Be There! The Great American Eclipse

Episode Summary

Executive Summary: This Planetary Radio episode centers on the upcoming Great American Eclipse, featuring Southern Illinois University Carbondale’s campus-wide celebration, Adler Planetarium’s outreach plans, and the Eclipse Mega Movie citizen-science project. It also includes updates on Cassini’s Saturn ring-plane dive, exoplanet counts, and skywatching tips, emphasizing the eclipse as a rare, shared scientific and cultural event.

Main Topics: Cassini’s Ring-Plane Dive and Saturn Science: Emily Lakdawalla describes Cassini’s first passage between Saturn and its rings as a major mission milestone that begins a new phase of science before Cassini’s eventual end. The dive should help constrain the mass and age of Saturn’s rings and improve knowledge of Saturn’s interior rotation. Southern Illinois University Carbondale’s Eclipse Celebration: SIU Carbondale outlines a multi-day public celebration for the eclipse, including a carnival, Comic-Con, expo, scientific workshop, and stadium viewing event. The university emphasizes outreach, student engagement, and large-scale public participation on campus. Adler Planetarium’s Outreach and Stadium Show: Michelle Nichols explains Adler’s role in supporting SIU and leading pre-eclipse outreach across the region through the Galaxy Ride program. Adler’s stadium show aims to engage thousands of attendees with participatory activities that make the eclipse a communal experience. The Eclipse Mega Movie Citizen-Science Project: Hugh Hudson and Mark Bender describe a continent-wide effort to collect eclipse images and video from both smartphones and high-end cameras. The project will build a time-resolved archive and movie of the corona while also enabling scientific analysis of coronal dynamics and lunar features. Eclipse Viewing Safety and Path of Totality: Multiple guests stress that viewers must travel into the path of totality and use proper eye protection outside totality. The episode repeatedly warns that 95% coverage is not enough and that the total eclipse experience is uniquely powerful and scientifically meaningful. Weekly Space Update and Exoplanet Milestone: Bruce Betts provides the usual skywatching segment, highlighting visible planets, space history, and a trivia answer about the number of confirmed exoplanets. He also shares updates on Mars Lego bricks and announces the next contest question.

Key Arguments: Cassini’s ring-plane crossing is scientifically important because it will help determine the mass and age of Saturn’s rings, which remain unknown after decades of study. SIU Carbondale should be a major eclipse destination because it sits in the path of totality and is preparing a richer public program than most other sites. The eclipse is not just a viewing event but a shared educational and cultural moment that can engage first-time observers, experienced eclipse chasers, students, and scientists together. The Eclipse Mega Movie will turn scattered observations into an unprecedented scientific archive by combining smartphone metadata, stills, and professional imaging into a time-domain dataset. Citizen science can contribute real research value, especially by capturing coronal evolution and potentially revealing details of the Moon’s limb and Bailey’s beads with new precision. The episode strongly argues that viewers should not settle for near-totality; being inside the path of totality is essential for the full visual, emotional, and scientific experience.

Data Points: Date of Great American Eclipse: August 21, 2017 - The episode’s main event and reason for the campus and outreach planning. Cassini ring-plane crossing: First time Cassini dived between Saturn and its rings - Described by Emily Lakdawalla as a major mission milestone. Cassini mission end: September 2017 - The mission was described as being in its final months after the ring-plane dive. SIU eclipse events span: Four days - Campus programming includes activities from Friday through Monday. Galaxy Ride outreach start: Monday, August 14 - Adler Planetarium’s outreach program begins the week before the eclipse. Stadium show attendance target: 10,000 to 15,000 people - Michelle Nichols described the scale of the planned SIU stadium engagement. Citizen Kate sites: About 60 sites - Mentioned as a nationwide network of volunteer eclipse observation sites. Citizen science project scale: One terabyte to a thousand terabytes - Estimated data volume for the Eclipse Mega Movie archive. High-end participation target: At least 1,000 participants - Google-sponsored DSLR/professional camera contributors for the Mega Movie. Smartphone participation target: About 100,000 participants - Projected scale for lower-barrier smartphone data collection. Confirmed exoplanets: 3,475 - Bruce Betts’ answer to the trivia question as of late April 2017. Multi-planet systems: 581 - Number of systems with more than one confirmed planet, cited in the trivia segment. Mass of discovered exoplanets: 9 x 10^29 kilograms - A listener calculation referenced by Bruce Betts, roughly 150,000 Earth masses. Path of totality coverage: 100% only at totality - Guests emphasize that viewers must be inside totality for the full experience. Moon measurement resolution: 5-meter resolution - Used to explain why the Moon is now a precise astrometric reference for eclipse imaging.

Pivotal Quotes: "It was the very first time that Cassini dived between Saturn's rings and the planet." — Emily Lakdawalla: Describing Cassini’s major orbital maneuver and its importance to the mission. "The only right place to be is in the path of totality." — Michelle Nichols: Her emphatic argument for traveling into totality rather than settling for a partial eclipse. "We could string all of these individual observations together right across the whole 90 minutes and make a movie." — Hugh Hudson: Explaining the core concept behind the Eclipse Mega Movie project.

Implications: The episode frames the eclipse as a once-in-a-generation public science event that can drive outreach, citizen science, and shared wonder. It also shows how new tools—smartphones, precise lunar data, and large networks—are changing how astronomy is observed and archived.