Main Engine Cut Off

Pam Melroy, three-time Space Shuttle commander and former NASA deputy administrator. She discusses Artemis program choices, Gateway versus surface dynamics, domestic political and budget pressures, commercial LEO strategy, Starliner and Mars Sample Return program challenges. Short, candid reflections on leadership, long timelines, and what fixes might keep US human spaceflight on track.

Paul Fjeld, a space artist with NASA and Smithsonian ties from the Apollo era, reflects on Artemis II and lunar history. He marvels at live crew moments, contrasts Apollo media with today’s streaming, and discusses human vision vs cameras. They debate Gateway and NRHO, lunar navigation advances, mission cadence, and the politics and hardware needed to return to the Moon.

Artemis II is underway with a spectacular first day. This episode of Main Engine Cut Off is brought to you by 32 executive producers—Donald, Matt, David, Joel, Frank, Better Every Day Studios, Natasha Tsakos, Tim Dodd (the Everyday Astronaut!), Lee, Fred, Will and Lars from Agile, Ryan, Warren, The Astrogators at SEE, Pat, Joakim, Miles O’Brien, Steve, Jan, Stealth Julian, Kris, Theo and Violet, Russell, Josh from Impulse, Joonas, and four anonymous—and hundreds of supporters. Topics NASA's Artemis II Live Mission Coverage (Official Broadcast) - YouTube Artemis II Flight Update: Perigee Raise Maneuver Complete; NASA to Hold Press Conference Artemis II Flight Update: Apogee Raise Burn Complete, Crew Looks Ahead to Proximity Operations Artemis II Flight Update: Proximity Operations Complete, Perigee Raise Burn Up Next Artemis II Flight Update: Crew and Ground Teams Successfully Troubleshoot Orion’s Toilet Artemis II Flight Update: Perigee Raise Burn Complete The Show Like the show? Support the show on Patreon or Substack! Email your thoughts, comments, and questions to anthony@mainenginecutoff.com Follow @WeHaveMECO Follow @meco@spacey.space on Mastodon Listen to MECO Headlines Listen to Off-Nominal Join the Off-Nominal Discord Subscribe on Apple Podcasts, Overcast, Pocket Casts, Spotify, Google Play, Stitcher, TuneIn or elsewhere Subscribe to the Main Engine Cut Off Newsletter Artwork photo by NASA/Bill Ingalls Work with me and my design and development agency: Pine Works

A concise breakdown of NASA’s Ignition announcements and how cutting programs exposes real bottlenecks. Discussion of Gateway’s cancellation and the shift toward surface-focused lunar plans. Examination of how removing interdependencies could reveal manufacturing and supply chokepoints. Debate over moving off SLS/ICPS and what that means for lunar landers and international partners.

Tom Mueller, founder and CEO of Impulse Space and veteran rocket engine engineer, discusses in-space mobility hardware. He recounts Mira’s flight history and Helios’ upcoming launch. He covers propulsion roadmaps from chemical to electric, new Colorado facilities, defense contracts, and plans to move large cargo to the Moon and beyond.

A sudden Artemis roadmap overhaul cancels major upgrades and refocuses on faster, simpler SLS flights. Plans shift Artemis 3 to an LEO test while making Artemis 4 the first lunar landing. The show digs into technical tradeoffs, program politics, contractor fallout, and whether an accelerated flight cadence can actually fix SLS problems.

Loren Grush, Bloomberg space reporter known for scoops on SpaceX, Blue Origin, and NASA. She breaks down SpaceX’s acquisition of xAI and how it ties to IPO plans. They discuss Blue Origin pausing New Shepard and what that means for its strategy. They also cover the Artemis II wet dress rehearsal and the resulting launch delay.

Artemis II is on the pad, and I can’t stop thinking about it. So I guess listen to me think in the open? Also, a ton of Blue Origin news—the next flight of New Glenn will feature a flown booster, they’ve announced constellation plans under the name TeraWave, and Tory Bruno has left ULA to join the team at Blue.This episode of Main Engine Cut Off is brought to you by 33 executive producers—Matt, Fred, Will and Lars from Agile, Kris, Lee, Jan, Frank, Miles O’Brien, Josh from Impulse, Theo and Violet, Ryan, Joakim, Stealth Julian, Heiko, Tim Dodd (the Everyday Astronaut!), Better Every Day Studios, Joel, Steve, Joonas, The Astrogators at SEE, Pat, Warren, Natasha Tsakos, Russell, David, Donald, and four anonymous—and hundreds of supporters.TopicsNASA’s Moonbound Artemis II Rocket Reaches Launch Pad - NASAFinal Steps Underway for NASA’s First Crewed Artemis Moon Mission - NASAIs Orion’s heat shield really safe? New NASA chief conducts final review on eve of flight. - Ars TechnicaBlue Origin makes impressive strides with reuse—next launch will refly booster - Ars TechnicaNew Glenn-3 to Launch AST SpaceMobile’s BlueBird Satellite | Blue OriginBlue Origin on X: “Our lunar lander is headed to the Lone Star State! ⭐ Blue Moon MK1 departed from Florida today, bound for @NASA_Johnson's Thermal Vacuum Chamber A, where it will undergo testing at the same facility as the Apollo spacecraft.”Another Jeff Bezos company has announced plans to develop a megaconstellation - Ars TechnicaFirst Take: What We Think Blue Origin’s TeraWave Actually Is (and Isn’t)In a surprise announcement, Tory Bruno is out as CEO of United Launch Alliance - Ars TechnicaBlue Origin on X: “We’re pleased to announce that @torybruno is joining Blue Origin as president, National Security, reporting to CEO Dave Limp. Tory will spearhead our newly formed National Security Group.”The ShowLike the show? Support the show on Patreon or Substack!Email your thoughts, comments, and questions to anthony@mainenginecutoff.comFollow @WeHaveMECOFollow @meco@spacey.space on MastodonListen to MECO HeadlinesListen to Off-NominalJoin the Off-Nominal DiscordSubscribe on Apple Podcasts, Overcast, Pocket Casts, Spotify, Google Play, Stitcher, TuneIn or elsewhereSubscribe to the Main Engine Cut Off NewsletterArtwork photo by Blue OriginWork with me and my design and development agency: Pine Works

Casey Dreier of The Planetary Society joins me to talk about the NASA FY2026 budget, the early days of the Administrator Isaacman era, and how we feel going into Artemis II.This episode of Main Engine Cut Off is brought to you by 33 executive producers—Matt, Fred, Will and Lars from Agile, Kris, Lee, Jan, Frank, Miles O’Brien, Josh from Impulse, Theo and Violet, Ryan, Joakim, Stealth Julian, Heiko, Tim Dodd (the Everyday Astronaut!), Better Every Day Studios, Joel, Steve, Joonas, The Astrogators at SEE, Pat, Warren, Natasha Tsakos, Russell, David, Donald, and four anonymous—and hundreds of supporters.TopicsCasey Dreier | The Planetary SocietyThe Planetary SocietyYou just saved NASA's budget | The Planetary Society2025 Impact Report | The Planetary SocietyThe ShowLike the show? Support the show on Patreon or Substack!Email your thoughts, comments, and questions to anthony@mainenginecutoff.comFollow @WeHaveMECOFollow @meco@spacey.space on MastodonListen to MECO HeadlinesListen to Off-NominalJoin the Off-Nominal DiscordSubscribe on Apple Podcasts, Overcast, Pocket Casts, Spotify, Google Play, Stitcher, TuneIn or elsewhereSubscribe to the Main Engine Cut Off NewsletterArtwork photo by Blue OriginWork with me and my design and development agency: Pine Works

Celebrate the holidays with intriguing space news! NASA has a new administrator, Jared Isaacman, who's bringing fresh energy. Trump pledges a Moon landing by 2028, followed by a lunar outpost. SpaceX gears up for an $800 billion IPO, aiming for a staggering $1.5 trillion valuation. There's surprising leadership change at ULA with Tory Bruno's exit. MAVEN's signal loss raises concerns, while Chinese astronauts tackle debris issues. Plus, launch highlights from around the globe make this a must-listen!