Cosmic Rants From Phil Plait, the Bad Astronomer

Episode Summary

Executive Summary: This episode of Planetary Radio blends mission updates with a lively debunking of astronomical myths. Emily Lakdawalla previews active solar system missions, especially MESSENGER at Mercury and Dawn at Vesta. Bill Nye highlights Kepler-based estimates suggesting billions of potentially Earth-like planets. Phil Plait critiques sensational claims about Apophis, supermoons, and a possible hidden giant planet, while Bruce Betts reports from a Shuttle Life experiment tied to astrobiology and gives the week’s skywatching and trivia.

Main Topics: MESSENGER begins Mercury science operations: Emily Lakdawalla explains the April mission slate, emphasizing MESSENGER’s commissioning and early imaging of Mercury’s previously unseen polar regions, plus early magnetometer and laser altimeter data. Kepler data and Earth-like planets: Bill Nye reacts to a first data-based estimate that Earth-like planets may be common, using it to argue that the universe likely contains many habitable worlds and bringing the Drake-equation question closer to empirical footing. Phil Plait on bad astronomy and media exaggeration: Plait dismantles misleading reporting on Apophis, the supermoon, and a hypothesized distant giant planet, arguing that real risks exist but hype and misused statistics distort public understanding. Asteroid Apophis risk assessment: Plait clarifies that Apophis’s 2036 impact probability is tiny, stressing that the object deserves monitoring but not panic, and criticizing misquotes and sensational headlines. Supermoon and earthquake myths: Plait explains that the so-called supermoon is a routine perigee full moon with modest tidal effects, and that linking it to major earthquakes is statistically unsupported. Shuttle Life and astrobiology testing: Bruce Betts reports from ATCC preparing microorganisms for a space shuttle flight, describing it as a rehearsal for the Phobos Life experiment and a test of panspermia-related survival in space. Weekly skywatch and trivia: Betts provides a short observing guide for Saturn, Venus, and the messenger mission fact, then runs the listener trivia contest about the second orbiter at Mars and previews the next question.

Key Arguments: MESSENGER’s early Mercury data matter because the mission is filling in previously unseen polar regions and generating the first meaningful magnetometer and altimetry datasets at the planet. Kepler-based analysis suggests Earth-like planets may be common enough that the galaxy could contain billions of them, making extraterrestrial life seem more plausible. Apophis should be monitored because asteroid impacts can be globally damaging, but current media claims of an imminent 2036 strike exaggerate a one-in-a-million risk. The supermoon is not a supernatural or disaster-causing event; tidal effects are real but modest, and earthquake correlations are not statistically supported. Claims that a distant giant planet has effectively been discovered are premature; at most, researchers have a tentative hypothesis that WISE data might later help test. The Shuttle Life experiment is valuable as a practical low-Earth-orbit rehearsal for studying organism survival and comparing results to the planned Phobos Life mission.

Data Points: Earth-like planet likelihood: 1 in 37 to 1 in 70 - Bill Nye cites this range as the estimated chance a star has an Earth-like planet based on Kepler analysis. Approximate number of stars in the Milky Way: 400 billion - Used by Bill Nye to scale the Kepler estimate into a large number of possible Earth-like planets. Estimated Earth-like planets in the galaxy: 10 billion - Bill Nye’s extrapolation from the occurrence rate and total star count. Apophis diameter: 200 meters wide - Phil Plait describes the asteroid’s size when discussing impact risk. Apophis impact probability: about 1 in 1,000,000 - Plait says the 2036 collision chance is tiny despite media hype. Mercury surface previously unimaged: about 5–10% - Emily Lakdawalla notes that only a small fraction of Mercury had not been imaged before MESSENGER’s orbital phase. Mars rover status: Opportunity left Santa Maria Crater - Emily’s solar-system roundup includes Opportunity resuming travel toward Endeavour. MESSENGER solar orbits before Mercury orbit insertion: 15 orbits - Bruce Betts gives this as the number of Sun orbits MESSENGER completed while adjusting its trajectory. Mars orbiter trivia answer: Mars 2 - Betts reports that the second orbiter at Mars was the Soviet Mars 2 spacecraft. Contest deadline: Monday, April 11 at 2 p.m. Pacific - Deadline for listeners to enter the trivia contest.

Pivotal Quotes: "There may be a 1 in 37 to 1 in 70 chance that a star out there has an Earth-like planet." — Bill Nye: He introduces the significance of Kepler-based estimates for Earth-like worlds. "If by authoritative you mean wrong." — Phil Plait: His response to media claims that Apophis will kill us in 2036. "The truth is, he's really not a bad astronomer, but he does talk a lot about bad astronomy." — Matt Kaplan: Introductory description of Phil Plait and the theme of his segment.

Implications: The episode reinforces evidence-based astronomy: missions are yielding real planetary data, exoplanets may be abundant, and sensational claims about celestial threats should be replaced with careful risk assessment and better science communication.