Phoenix is Dead...Long Live Phoenix!

Episode Summary

Executive Summary: This episode centers on the end of Phoenix and the science it leaves behind, especially its perchlorate findings and implications for Martian habitability and future missions like Curiosity. The show also highlights WISE’s asteroid discoveries, NASA’s proposed exploration technologies, and space updates from Atlantis, SOFIA, and the night sky.

Main Topics: Phoenix Mars lander mission ends: Peter Smith confirms Phoenix is finished after HiRISE images show damage from Martian winter and likely loss of solar panels. The team reflects on the mission’s successful science return and legacy. Perchlorates and the search for life on Mars: Phoenix’s perchlorate discovery is framed as a major astrobiology result because perchlorates can lower freezing points, may support liquid water, and can affect organic detection experiments. Impact on future Mars missions, especially Curiosity: Smith explains how Phoenix reshaped upcoming Mars Science Laboratory plans, especially by warning scientists not to heat samples before searching for organics. WISE all-sky survey asteroid results: Emily reports that WISE has uncovered tens of thousands of asteroids, including a large number of previously unknown objects and near-Earth objects, prompting follow-up tracking by amateurs and professionals. NASA’s six new technology initiatives: Bill Nye praises NASA’s investment in six enabling technologies such as propellant depots, solar electric propulsion, inflatable modules, aero capture, auto-docking, and advanced life support. Weekly space updates and night sky: Bruce Betts covers the shuttle Atlantis return, SOFIA’s first light, skywatching targets, space history, the Moon’s effect on Earth’s rotation and orbit, and the Icaros trivia contest.

Key Arguments: Phoenix is conclusively dead as a spacecraft, but its science continues to influence Mars research and mission planning. The perchlorate layer found by Phoenix may be central to understanding Mars habitability because it can act as antifreeze and potentially as a food source for microbes. Future Mars missions should avoid heating samples first, since perchlorates may destroy organics and mimic false negatives in legacy experiments. WISE’s all-sky survey is extraordinarily productive because it is finding many previously unknown asteroids, including near-Earth objects that require tracking. NASA should invest in foundational exploration technologies now because they enable cheaper, more ambitious, and longer-duration missions later. The Moon is gradually receding from Earth while also slowing Earth’s rotation, a long-term dynamical effect measurable today.

Data Points: WISE sky coverage: about 70% - Emily says WISE has mapped roughly 70% of the sky in its all-sky survey WISE processed survey material: about 50% - Emily notes that about half of the all-sky material had been processed Asteroids spotted by WISE: 60,000 - Total asteroids identified in the survey so far New asteroids discovered by WISE: 11,000 - Asteroids newly found to science New asteroid share: more than 1 in 6 - Proportion of WISE asteroids that were previously unknown Comets observed by WISE: 70 - Additional small bodies observed by WISE New comets found by WISE: 12 - Previously unknown comets among those observed Near-Earth objects observed by WISE: 200 - Asteroids classified as near-Earth objects New near-Earth objects: 50 - Near-Earth objects not previously seen before WISE Curiosity launch window: November 2011 - Peter Smith references the upcoming Mars Science Laboratory launch schedule Mars Science Laboratory cost: over $2 billion - Used as a comparison to Phoenix’s lower mission cost Phoenix mission cost: $400 million - Smith calls Phoenix a bargain basement mission compared with core missions Phoenix mission cost relative to core missions: 20% - Phoenix is described as about one-fifth the cost of a core mission Time Phoenix operated on Mars: five months - Duration of the mission in the polar region Perchlorate-related water stability: down to minus 70°C - Smith explains perchlorates can allow liquid water at very low temperatures Mars Science Laboratory organics detection range: 1 to 10 parts per million - Smith expects Curiosity may detect organics if Phoenix’s interpretation is correct Earth’s day slowdown: about two milliseconds per century - Bruce Betts describes the Moon’s long-term tidal effect on Earth’s rotation Moon measurement time span: since about 1970 - Current lunar recession has been measured over the modern laser-ranging era

Pivotal Quotes: "The layer. That's where the action is." — Peter Smith: Smith emphasizes the perchlorate-rich layer as the key scientific finding from Phoenix "Don't heat up the perchlorate." — Peter Smith: He explains the practical lesson for future Mars organics experiments "This is what NASA should be doing. This is a road beyond the horizon to new, exciting places." — Bill Nye: Nye applauds NASA’s investment in enabling exploration technologies

Implications: Phoenix’s legacy reshapes Mars astrobiology and future mission design, especially sample handling and life-detection strategy. WISE’s discoveries also show how survey missions can rapidly expand planetary defense and small-body science.