Main Engine Cut Off

Tom Mueller, Founder and CEO of Impulse Space, joins me to catch up on the company’s progress and plans—3 Mira missions flown, Helios soon to fly, $525M raised, new defense contracts, a lunar lander concept, and a new Colorado facility.

This episode of Main Engine Cut Off is brought to you by 33 executive producers—Joel, Tim Dodd (the Everyday Astronaut!), Warren, Steve, Ryan, Will and Lars from Agile, Natasha Tsakos, Russell, Joakim, Theo and Violet, The Astrogators at SEE, Matt, Lee, Donald, Heiko, Better Every Day Studios, Josh from Impulse, Miles O’Brien, Stealth Julian, David, Joonas, Kris, Frank, Jan, Fred, Pat, and four anonymous—and hundreds of supporters.

Topics

Impulse Space

Careers - Impulse Space

Tom Mueller (@lrocket) / X

Inside Impulse’s New Colorado Facility

Impulse Space Secures $300 Million Series C to Accelerate the Future of In-Space Mobility

Starfish Space Completes Autonomous Rendezvous and Proximity Mission in LEO with Impulse Space

To the Moon (and Beyond): How Impulse Can Deliver More Mass to the Lunar Surface ​​​​‌‍​‍​‍‌‍‌​‍‌‍‍‌‌‍‌‌‍‍‌‌‍‍​‍​‍​‍‍​‍​‍‌​‌‍​‌‌‍‍‌‍‍‌‌‌​‌‍‌​‍‍‌‍‍‌‌‍​‍​‍​‍​​‍​‍‌‍‍​‌​‍‌‍‌‌‌‍‌‍​‍​‍​‍‍​‍​‍​‍‌​‌‌​‌‌‌‌‍‌​‌‍‍‌‌‍​‍‌‍‍‌‌‍‍‌‌​‌‍‌‌‌‍‍‌‌​​‍‌‍‌‌‌‍‌​‌‍‍‌‌‌​​‍‌‍‌‌‍‌‍‌​‌‍‌‌​‌‌​​‌​‍‌‍‌‌‌​‌‍‌‌‌‍‍‌‌​‌‍​‌‌‌​‌‍‍‌‌‍‌‍‍​‍‌‍‍‌‌‍‌​​‌​​​‌‍‌‌‌‍‌‍​‌‍​‌‌​​‌​‍‌​​​​‍‌‌‍​‌‍‌‍​‍​‌‍‌​​‍‌​‌​​‌‍​​‌​‍‌​‍‌​‍​‌‍‌‌​‍​‌‍​‍​‍‌‌‍​‍‌‍‌‍​‌​​‍‌​‍​​​‍​‌‌‍​‌​​‍‌‍​‌‍‌‌​‌​‍‌‌​‌‍‌‌​​‌‍‌‌​‌‌‌‌‌​​‌‍‌​‌‍​‌‌‌​‌‍‌‌​‍‌​​‌‍​‌‌‌​‌‍‍​​‌‌‌​‌‍‍‌‌‌​‌‍​‌‍‌‌​‌‍​‍‌‍​‌‌​‌‍‌‌‌‌‌‌‌​‍‌‍​​‌​‍‌‌​​‍‌​‌‍‌​‌‌​‌‌‌‌‍‌​‌‍‍‌‌‍​‍‌‍‌‍‍‌‌‍‌​​‌​​​‌‍‌‌‌‍‌‍​‌‍​‌‌​​‌​‍‌​​​​‍‌‌‍​‌‍‌‍​‍​‌‍‌​​‍‌​‌​​‌‍​​‌​‍‌​‍‌​‍​‌‍‌‌​‍​‌‍​‍​‍‌‌‍​‍‌‍‌‍​‌​​‍‌​‍​​​‍​‌‌‍​‌​​‍‌‍​‌‍‌‌​‌​‍‌‍‌‌​‌‍‌‌​​‌‍‌‌​‌‌‌‌‌​​‌‍‌​‌‍​‌‌‌​‌‍‌‌​‍‌‍‌​​‌‍​‌‌‌​‌‍‍​​‌‌‌​‌‍‍‌‌‌​‌‍​‌‍‌‌​‍​‍‌‌

Introducing the Upgraded Mira: Bringing In-Space Mobility to GEO and Beyond

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Artwork photo by NASA/John Kraus

Work with me and my design and development agency: Pine Works

NASA Administrator Jared Isaacman announced a sweeping roadmap change to the Artemis program this morning—seemingly cancelling the EUS, Gateway, and all SLS upgrades, and instead pursuing the once-and-future annual launch cadence of SLS.

This episode of Main Engine Cut Off is brought to you by 33 executive producers—David, Russell, Pat, Better Every Day Studios, Joonas, Josh from Impulse, Theo and Violet, Steve, Jan, Will and Lars from Agile, Miles O’Brien, Kris, Fred, Stealth Julian, Frank, Joakim, Ryan, Warren, Matt, The Astrogators at SEE, Joel, Lee, Tim Dodd (the Everyday Astronaut!), Donald, Natasha Tsakos, Heiko, and four anonymous—and hundreds of supporters.

Topics

NASA shakes up its Artemis program to speed up lunar return - Ars Technica

NASA Adds Mission to Artemis Lunar Program, Updates Architecture - NASA

NASA Administrator Jared Isaacman on X: “President Trump gave the world the Artemis Program, and NASA and our partners have the plan to deliver. We will standardize architecture where possible, add missions and accelerate flight rate, execute in an evolutionary way, and safely return American astronauts to the Moon…”

NASA Administrator Jared Isaacman on X: “…and this is how we’re going back.”

Teams Begin Artemis II Repairs in Vehicle Assembly Building - NASA

The Show

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Artwork photo by NASA/John Kraus

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Loren Grush, of Bloomberg, joins me to talk about SpaceX’s acquisition of xAI, its preparation for a potential IPO, Blue Origin’s cancellation of New Shepard and their recent momentum, and the delay to Artemis II following its first wet dress rehearsal.
This episode of Main Engine Cut Off is brought to you by 33 executive producers—David, Natasha Tsakos, Stealth Julian, Warren, Joakim, Tim Dodd (the Everyday Astronaut!), Miles O’Brien, Pat, Better Every Day Studios, Will and Lars from Agile, The Astrogators at SEE, Steve, Joonas, Frank, Fred, Heiko, Donald, Lee, Russell, Kris, Ryan, Theo and Violet, Joel, Matt, Jan, Josh from Impulse, and four anonymous—and hundreds of supporters.
Topics
SpaceX Acquires xAI as Musk Prepares for Mega IPO - Bloomberg
SpaceX-xAI Deal Blurs Musk’s Once-Clear Space Exploration Mission - Bloomberg
Loren Brichter, a High Priest of App Design - WSJ
Blue Origin to Pause New Shepard Flights for No Less Than Two Years | Blue Origin
NASA Conducts Artemis II Fuel Test, Eyes March for Launch Opportunity   - NASA
The Show
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Email your thoughts, comments, and questions to [email protected]
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Artwork photo by NASA/John Kraus
Work with me and my design and development agency: Pine Works

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.
Topics
NASA’s Moonbound Artemis II Rocket Reaches Launch Pad - NASA
Final Steps Underway for NASA’s First Crewed Artemis Moon Mission - NASA
Is Orion’s heat shield really safe? New NASA chief conducts final review on eve of flight. - Ars Technica
Blue Origin makes impressive strides with reuse—next launch will refly booster - Ars Technica
New Glenn-3 to Launch AST SpaceMobile’s BlueBird Satellite | Blue Origin
Blue 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 Technica
First 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 Technica
Blue 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 Show
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Artwork photo by Blue Origin
Work 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.
Topics
Casey Dreier | The Planetary Society
The Planetary Society
You just saved NASA's budget | The Planetary Society
2025 Impact Report | The Planetary Society
The Show
Like the show? Support the show on Patreon or Substack!
Email your thoughts, comments, and questions to [email protected]
Follow @WeHaveMECO
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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 Blue Origin
Work with me and my design and development agency: Pine Works