Looking back on 2024

Episode Summary

Executive Summary: Planetary Radio’s year-end episode reviews 2024 as a standout year for space exploration, marked by advocacy wins, major launches, lunar and Mars milestones, planetary defense progress, and human spaceflight advances. Europa Clipper, OSIRIS-REx, Ingenuity, Curiosity/Perseverance, Hera, and Parker Solar Probe highlight how science, engineering, and public support shaped the year.

Main Topics: Europa Clipper and the power of advocacy (Priority: 5/5): Kate Howells explains that Europa Clipper dominated Planetary Society’s Best of 2024 awards, reflecting more than a decade of member advocacy, outreach to Congress, and sustained public support that helped make the mission possible. Major 2024 space exploration highlights (Priority: 5/5): The panel surveys the biggest space moments of the year, including the total solar eclipse, solar maximum, aurora activity, Parker Solar Probe’s near-Sun passes, and a broad set of planetary science achievements. Lunar exploration breakthroughs (Priority: 5/5): The discussion covers Japan’s SLIM precision landing, Intuitive Machines’ Odysseus commercial lunar landing, and China’s Chang’e 6 far-side sample return, emphasizing how 2024 advanced lunar capability across multiple nations and sectors. Mars science and the end of Ingenuity (Priority: 5/5): The team reflects on Ingenuity’s unexpectedly long mission, its crash analysis, Curiosity’s discovery of pure sulfur, and Perseverance’s Cheyava Falls findings that may represent one of the strongest potential biosignature leads on Mars. Asteroids, sample return, and planetary defense (Priority: 4/5): OSIRIS-REx’s Bennu samples were finally opened and analyzed, revealing carbon and hydrated minerals, while NEOWISE ended and Hera launched to follow up on DART, underscoring the link between science and defense against near-Earth objects. Commercial and crewed spaceflight growth (Priority: 4/5): The episode contrasts Boeing Starliner’s problems with SpaceX’s strong year, including Starship’s booster catch and Polaris Dawn’s record-setting private human spaceflight achievements, showing commercial space’s growing influence and risks. Institutional strain and future advocacy (Priority: 4/5): Repeated concern is expressed over JPL layoffs, NASA funding uncertainty, and the need to protect mission teams and institutions, with listeners urged to support advocacy efforts and congressional outreach in 2025.

Key Arguments: Europa Clipper’s launch was not just a mission milestone but proof that long-term public advocacy can influence federal space priorities. The total solar eclipse was a historic public science event, likely the most viewed total solar eclipse in human history, reinforcing the cultural power of space science. Solar maximum increased the likelihood of geomagnetic storms, making Parker Solar Probe and aurora observations especially significant for heliophysics. Lunar exploration is becoming international and increasingly commercial, with JAXA, China, U.S. private industry, and NASA all contributing major steps. Mars remains central to astrobiology, with Curiosity and Perseverance producing evidence that could reshape the search for ancient life and sample return priorities. Planetary defense is a solvable problem if governments fund dedicated detection and tracking systems like NEO Surveyor and continue deflection work like DART/Hera. Commercial spaceflight made real progress, but Starliner’s issues show that safety, quality control, and institutional discipline remain essential. Preserving NASA and JPL expertise matters because the loss of specialized teams can slow or weaken flagship science missions.

Data Points: Planetary Society member advocacy messages to Congress: ~400,000 - Used by Kate Howells to describe support behind Europa Clipper advocacy Europa Clipper travel time to Europa: 6 years - Mission launched in 2024 and is expected to arrive around 2030 Total solar eclipse viewers in totality: 50 million - Approximate number of people who witnessed totality in April 2024 Partial eclipse viewers: 600 million - Approximate number of people who were under the partial eclipse Solar cycle: 11-year activity cycle - Asa Stahl explains solar maximum and solar minimum Geomagnetic storm level: G5 - May 2024 solar storm described as the most severe category Parker Solar Probe Venus flyby distance: 233 miles - Final Venus gravity assist at the start of November Parker Solar Probe closest pass date: December 24, 2024 - Set to become the closest human-made object to the Sun ACS-3 launch date: April 23, 2024 - NASA’s solar sail technology demo Starship integrated flight test: Flight Test 5 - SpaceX’s booster catch was discussed in relation to this test Polaris Dawn launch date: September 10, 2024 - Private mission led by Jared Isaacman Polaris Dawn mission duration: 5 days - Mission duration mentioned in recap SLIM landing date: January 19, 2024 - Japan’s precision lunar landing SLIM target accuracy: Within 100 meters; achieved about 50 meters - Precision landing objective and actual result SLIM soft-landing rank for Japan: 5th country - Japan became the fifth nation to soft-land on the Moon Odysseus landing region: South polar region - First U.S. lunar landing in over 50 years and first commercial lunar landing Chang’e 6 sample-return location: Far side of the Moon / South Pole-Aitken Basin - Described as a major triumph in lunar science Ingenuity flight count: More than 70 flights - Exceeded original plan of 5 flights Ingenuity mission duration: Almost 1,000 days - Far beyond its original one-month demo plan OSIRIS-REx sample opening date: January 10, 2024 - NASA finally accessed the Bennu material after stubborn fasteners were removed Europa Clipper launch delay factor: Hurricane Milton - Launch was delayed by severe weather at Cape Canaveral Hera launch date: October 2024 - ESA follow-up mission to DART launched one week before Europa Clipper NEOWISE asteroid discoveries: Over 300 - Mission discovered more than 300 near-Earth objects

Pivotal Quotes: "Europa Clipper really swept the awards this year." — Kate Howells: Introduced the Best of 2024 awards discussion and the mission’s dominance "It is always so gratifying to see all of these other developers of solar sails crediting the Planetary Society for proving the concept." — Kate Howells: Discussing ACS-3 and the society’s LightSail legacy "This is a really powerful thing. So, who knows what's going to happen in the next year?" — Sarah Al-Ahmed: Closing reflection on the value and uncertainty of future space advocacy

Implications: 2024 showed that long-horizon science missions, public advocacy, and international collaboration can deliver major results. But staffing losses and funding uncertainty threaten future progress, making 2025 a critical year for sustained support, especially in planetary defense, lunar exploration, and Mars science.