An Optical SETI Update From Paul Horowitz

Episode Summary

Executive Summary: This Planetary Radio episode centers on the defense of NASA’s James Webb Space Telescope amid funding cancellation threats, a Bill Nye segment urging support for science and exploration, and an in-depth interview with Harvard’s Paul Horowitz about major advances in optical SETI. The show closes with Bruce Betts’ sky report, a shuttle-history trivia contest, and a tribute to Atlantis’ final mission.

Main Topics: James Webb Space Telescope funding controversy: Emily Lakdawalla discusses the House Appropriations Committee move to cancel Webb funding and urges listeners to contact Congress, framing the telescope as a symbol of exploration and scientific ambition. Bill Nye on public support for space exploration: Bill Nye, speaking from TAM in Las Vegas, argues that cutting Webb is shortsighted and that science inspires future generations; he connects this to broader support for human and robotic exploration. Paul Horowitz and optical SETI advances: Horowitz explains why he remains committed to searching for laser flashes from extraterrestrial civilizations, and details the latest hardware/software upgrades improving Harvard’s all-sky optical SETI system. SETI strategy and detection limits: The discussion compares targeted versus all-sky searches, emphasizing that current searches sample only brief moments and are constrained by detector sensitivity and wavelength coverage. Infrared upgrade path for optical SETI: Horowitz describes plans to move from blue/visible toward red and near-infrared detectors, which would improve galactic transparency, reduce stellar background, and increase photon counts. Night sky report, space history, and trivia: Bruce Betts previews visible planets, highlights Apollo 11 and Viking 1 anniversaries, explains shuttle numbering, and runs the Moonshot giveaway trivia contest.

Key Arguments: Canceling Webb would damage science, exploration, and public inspiration; listeners should contact Congress to oppose it. Space exploration matters not just for practical outcomes but for the joy of discovery and the long-term advancement of knowledge. SETI should continue because even a null result eliminates plausible scenarios and refines the search for extraterrestrial intelligence. All-sky optical SETI remains valuable because the sky is vast and targeted searches alone risk missing the right source. Upgrading to faster FPGAs and better detectors will make optical SETI far more sensitive and capable of distinguishing artificial signals from natural flashes. Moving into the infrared is strategically important because it improves visibility through the Milky Way, lowers stellar background, and yields more photons for detection.

Data Points: James Webb Space Telescope funding: canceled by the House Appropriations Committee - Emily Lakdawalla’s segment on congressional action against NASA funding Haleakala excursion: horse ride down into the middle of Haleakala - Emily Lakdawalla describing her Hawaii trip Stars searched in early targeted optical SETI: 5,000 to 6,000 - Horowitz recounting the original targeted search with a 61-inch telescope Current optical SETI sky coverage: entire northern sky 3 or 4 times - Horowitz describing the all-sky search over about five years Sampling rate: about a tera sample per second - Horowitz on the current optical camera system Upgrade power increase: 16 times as powerful - Horowitz describing the new FPGA-based system Additional data per channel: 10 to 20 times as much - Expected improvement from the upgraded optical SETI hardware Infrared detector cost: about $4,500 per piece - Horowitz on the new near-infrared detectors Number of infrared detectors still needed: 15 - Horowitz says one sample has been tested and 15 more are required Planetary Society membership: nearly 100,000 members - Robert Picardo promotion for the Planetary Society Apollo 11 landing anniversary: 42nd anniversary - Referenced in the show’s closing segment Viking 1 Mars landing anniversary: 1976 - Bruce Betts’ space history note Space shuttle landing sites: 3 - Bruce Betts’ trivia question about Kennedy, Edwards, and White Sands

Pivotal Quotes: "I do not want to live in a world where we only focus on suck and never think about awesome." — Vlog Brothers (quoted by Emily Lakdawalla): Used to defend the value of the James Webb Space Telescope and exploration "That's not how you move forward, everybody. That's not how you engage future generations in the enterprise of science." — Bill Nye: Arguing against canceling Webb and for continued investment in science "The greatest discovery in humankind." — Paul Horowitz: Horowitz describing the potential significance of detecting extraterrestrial intelligence

Implications: The episode frames space science as culturally and scientifically essential. It signals continued pressure to defend flagship missions like Webb while highlighting how incremental technology upgrades are making the search for extraterrestrial intelligence more practical and more sensitive.