Episode Details

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Today's topics:

Artemis II lunar flyby milestone - NASA’s Artemis II completed a 10-day crewed lunar flyby and safely splashed down on April 10, 2026, setting a new record for farthest human travel. The mission validated Orion, the Space Launch System, and critical life-support systems for future Moon and Mars plans.

Commercial launches and megaconstellations - SpaceX continued high-cadence Falcon 9 operations with multiple Starlink deployments and routine booster recovery, while ULA launched Amazon’s LeoSat satellites. The early April 2026 manifest highlights sustained competition and capacity growth in commercial spaceflight.

April skywatching: comets and meteors - April 2026 offered standout observing targets: Mercury at greatest elongation, Comet C/2025 R3’s close approach, and the Lyrid meteor shower peak. Skywatchers also tracked the near-Earth flyby of asteroid 2026 GD, which posed no danger.

Gravitational waves and black holes - New results from LIGO-Virgo-KAGRA refined how compact objects merge, including a neutron star–black hole event with unusual orbital properties and evidence supporting a black-hole ‘mass gap.’ Astronomers also reported strong evidence for a binary supermassive black hole system in Markarian 501 that could merge on relatively short cosmic timescales.

Exoplanets, ancient stars, dwarf galaxies - TESS added an Earth-sized world, TOI-4616 b, while archives expanded with new spectra including unusual systems. Researchers also flagged an extremely ancient star that migrated into the Milky Way and confirmed Andromeda XXXVI as an ultra-faint, metal-poor relic dwarf galaxy.

Episode Transcript

Artemis II lunar flyby milestone
NASA’s Artemis II has returned safely to Earth, completing a historic ten-day crewed lunar flyby that concluded with a Pacific splashdown on April 10, 2026. Launched April 1 from Kennedy Space Center, Orion—named Integrity—carried commander Reid Wiseman, pilot Victor Glover, mission specialist Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen, the first Canadian to travel beyond Earth orbit. Artemis II pushed humans farther from Earth than ever before, surpassing the Apollo 13 free-return record, and validated critical deep-space life-support and spacecraft handling systems ahead of future lunar surface missions.

Commercial launches and megaconstellations
The mission also served as the first crewed flight test of the Space Launch System and Orion stack, with astronauts conducting manual piloting demonstrations and extensive systems checkouts. Orion’s European Service Module delivered power, propulsion, and life support, using large solar arrays and a suite of engines—including a repurposed Space Shuttle engine—to execute key trajectory maneuvers. During re-entry, Orion endured extreme heating—reported up to about 5,000 degrees Fahrenheit on the heat shield—before recovery teams confirmed the crew was in excellent condition following medic