The First Nuclear-Powered Spaceship Is Going to Mars

NASA is building SR-1 Freedom, the first nuclear-powered interplanetary spacecraft: a reactor launched switched off, turned on only after leaving Earth, powering electric thrusters to Mars, where it releases three SkyFall helicopters. How does nuclear electric propulsion work, why is the US flying a reactor for the first time since 1965, and when does it launch? (Megaworks, also searched as mega works and Mega Works.) Chapters 0:00 Cold open 0:40 What NASA just announced 1:41 Why go nuclear? 2:15 How a nuclear electric spaceship works 3:42 A spaceship from a cancelled station 4:28 The only US reactor in space, 1965 5:24 Launched cold 6:16 The long way to Mars 7:05 SkyFall: helicopters from the sky 8:54 What to watch Key facts (with sources; all future dates are NASA targets, not guarantees): Announced 24 Mar 2026 at NASA's Ignition event; launch targeted for the 2028 Mars window, Nov-Dec 2028 (NASA; SkyFall Mission Information Package). About 12,000 kg (26,455 lb); HALEU-fuelled reactor; 20 kWe closed Brayton cycle power conversion; Power and Propulsion Element bus (48 kW solar); 12-kW AEPS Hall thruster (NASA SR-1 Freedom mission page). Reactor stays inactive until the spacecraft leaves Earth orbit; reactor on within 48 hours of launch (NASA Glenn, 20 Oct 2026; NASA fact sheet). Reactor designed by DOE's Idaho National Laboratory; Sierra Lobo builds the Brayton power conversion system (NASA Glenn, 20 Oct 2026). Estimated cost about $2.1 billion (NASA documents reported by Politico; Nuclear Engineering International, 27 Jul 2026). SNAP-10A (3 Apr 1965), the only US reactor flown in space: over 600 W, 43 days, still in a ~4,000-year orbit (US DOE ETEC). SkyFall: three Ingenuity-derived helicopters released mid-air at ~1 km; ground-penetrating radar to ~3-5 m; ~2.5-min flights of 1-2 km; 50-300 km each; reference site Arcadia Planitia; ~2-year "backflip" trajectory, landing ~Sep 2030 (NASA/JPL SkyFall Mission Information Package, Sep 2026). NASA's mission page lists target arrival 2029 (Mars flyby). Firefly Aerospace: $13M JPL subcontract for the SkyFall aeroshell (Firefly, 7 Jul 2026). Ingenuity flew 72 flights, planned up to 5 (NASA/JPL). Sources: NASA, Space Reactor-1 Freedom mission page: https://www.nasa.gov/mission/space-re... NASA Glenn, "NASA's SR-1 Freedom Advances with Progress on Nuclear Power Module" (20 Oct 2026): https://www.nasa.gov/centers-and-faci... NASA, "NASA Unveils Initiatives to Achieve America's National Space Policy" (24 Mar 2026): https://www.nasa.gov/news-release/nas... NASA fact sheet, "America Underway in Space on Nuclear Power": https://www.nasa.gov/wp-content/uploa... NASA/JPL, SkyFall Mission Information Package (Sep 2026): https://science.nasa.gov/wp-content/u... SpaceNews (26 Mar 2026): https://spacenews.com/nasa-to-test-nu... American Nuclear Society (25 Mar 2026): https://www.ans.org/news/2026-03-25/a... Scientific American (31 Mar 2026): https://www.scientificamerican.com/ar... Nuclear Engineering International (27 Jul 2026): https://www.neimagazine.com/news/nasa... Firefly Aerospace (7 Jul 2026): https://fireflyspace.com/news/firefly... US DOE ETEC, SNAP overview: https://www.energy.gov/etec/system-nu... Aerospace America (20 Oct 2026): https://aerospaceamerica.aiaa.org/spo... Footage and photos (each credited on screen): NASA, NASA/JPL-Caltech, NASA Glenn and US Department of Energy media, public domain (NASA media guidelines; no endorsement implied), via images.nasa.gov and Wikimedia Commons. Spacecraft renders are NASA artist concepts. Diagrams are original Megaworks schematics. Thumbnail and Shorts covers are Megaworks illustrations (AI-assisted art, not photographs). Music: "Ignition Drive", original Megaworks synthesis (no samples). Narration: Chatterbox-Turbo TTS (MIT), synthetic voice. Megaworks explains the biggest machines and the tech building the future. Subscribe for more. #SR1Freedom #NASA #Mars #NuclearPropulsion #SkyFall #Megaworks #MegaWorks #Space