I’m Anthony Colangelo.

Eric Berger, Senior Space Editor at Ars Technica, joins me to talk SLS/Orion, New Space vs. Old Space, space policy in the Trump administration, and why the fight might not be settled until 2020.

Just what goes into the engineering feat of landing a 180 foot tall booster that’s rocketing through the sky? How does SpaceX guide the booster back to land or the barge? And what keeps aerodynamic and thermal forces from ripping apart the thin-skinned booster? Fellow space podcaster Anthony Collangelo, host of the “Main Engine Cut Off” podcast joins us to talk about just what goes into bringing the booster safely back to earth.

As the award date approaches for the 2018 Air Force launch vehicle development contracts, we keep hearing from Congress about how they would like to see it go. And I discuss the future of Antares and the Next-Generation Launch Vehicle in light of the continuing flights of Cygnus on Atlas V.

SpaceX made history this week by launching SES-10 with a previously-flown first stage. I discuss implications of this achievement, the things we learned from Elon Musk in the post-flight press briefing, and the doubters, as always.

The last two weeks have been filled with a bunch of smaller stories—SpaceX’s GPS III bid win and upcoming SES-10 launch, ULA’s decision on Vulcan’s engines and Congress’ potential meddling, and the ISS beyond 2024.

This week, Blue Origin shed some more light on New Glenn—by way of an animation, launch agreements, and a talk by Jeff Bezos at Satellite 2017—and the first fully-assembled BE-4 shipped to their test site in Texas for a hot firing. I discuss the new details we learned and how New Glenn will fit into the industry in the 2020s.

This week is all about #hotdrama, with two surprise media briefings: one from NASA on a potential crewed EM-1, and one from SpaceX on a privately-crewed journey around the Moon—riding on a Dragon 2 and Falcon Heavy—at the end of 2018. I discuss the implications of both, and go on a rant about SpaceX and “focus.” This episode of Main Engine Cut Off is brought to you by 5 executive producers—Pat, Matt, Jorge, Brad, and one anonymous—and 34 other supporters on Patreon.

Robert Lightfoot, the Acting NASA Administrator, sent a memo to the agency on the possibility of putting a crew on EM-1. I discuss the potential fallout from this idea and where the SLS/Orion program may be heading in the future.

This week, NASA officially announced that NanoRacks will be adding an airlock onto the International Space Station to add capabilities and capacity to their already-up-and-running business. That announcement, along with some early insight into NASA policy in 2017, got me thinking about commercial opportunities within government programs, beyond Commercial Cargo and Crew.

Marcia Smith of SpacePolicyOnline.com saw a draft of the 2017 NASA Transition Authorization Act, and it contains some very interesting changes from the 2016 version that bounced around Congress last year. I discuss what some of these changes may mean in the light of Commercial Crew delays, NASA RFIs regarding SLS and Orion, and continued Russian reliability issues.