Two months from now, the largest American lunar lander ever built is supposed to lift off from Kennedy Space Center on a Falcon Heavy rocket and head for the Moon's south pole. Astrobotic's Griffin Mission 1 targets a landing in the Nobile Crater region, carrying a 500-kilogram rover, a small CubeRover, and a suite of secondary payloads, all to a destination that has never seen a successful soft landing from any spacecraft. The mission has already survived one gut-punch. NASA's VIPER rover, the water-ice hunter that was supposed to anchor Griffin's payload and justify the whole program, was canceled in July 2024. What replaced it, Astrolab's FLIP rover , is now the heaviest U.S. rover built for the Moon to date, and the mission continues on schedule for a NET July 2026 launch. AI-generated image Astrobotic's Griffin lander approaching integration milestones ahead of its July 2026 launch target. Credit: AI-generated / Cislunar News June 2026 Update: Griffin Now Has Voyager Behind It Voyager Technologies announced on June 2 that it will acquire Astrobotic in a cash-and-stock deal valued at up to $300 million . The transaction is expected to close by early July, just as Griffin Mission One moves through final integration and launch preparation. Astrobotic says Griffin Mission One continues on schedule. That matters because the mission is no longer just a recovery story after VIPER. It is now the first visible test of Voyager's plan to assemble a lunar platform around Astrobotic landers, LunaGrid surface power, Max Space habitation work, dust mitigation, mission management, and resource-use technology. For Griffin, the near-term question is execution. The lander still has to complete propulsion integration, environmental acceptance testing, payload integration, and launch readiness before a Falcon Heavy trip to the lunar south pole. Voyager adds balance-sheet support and a clearer industrial thesis, but it does not remove the landing risk. The Largest American Lander Since Apollo Griffin is not a small spacecraft. Its structural test model weighs more than 13,000 pounds fully loaded, and the lander measures roughly 15 feet across once its landing legs are deployed. That makes it, by any reasonable measure, the largest American lunar lander to attempt a touchdown since the Apollo program ended in 1972. The design is built around what Astrobotic calls a flexible cargo platform. A central aluminum frame supports the propulsion system, avionics, and solar panels, while payload mounting options exist both above and below the main deck. Griffin can carry 625 kilograms to the lunar surface, enough to handle a rover the size of a small car or a stack of science instruments. Propulsion centers on four main engines with additional attitude control thrusters. All four Composite Overwrapped Pressure Vessel propellant tanks are in active integration as of the latest mission update, with avionics , designed and built in-house , already accepted for flight. The decision to build avionics internally, rather than buy off-the-shelf components, lets Astrobotic iterate fast and carry forward designs to future missions without requalifying everything from scratch. 625 kg Payload capacity to lunar surface 15 ft Deployed width across landing legs ~5,900 kg Structural test model mass (fully loaded) 100 m Autonomous landing precision target 7 Main descent engines Jul 2026 Launch target (NET) on Falcon Heavy After VIPER: How FLIP Became the Mission AI-generated image Astrolab's FLIP rover is now the primary payload for Griffin Mission 1, replacing the canceled VIPER rover. Credit: AI-generated / Cislunar News When NASA canceled the Volatiles Investigating Polar Exploration Rover in July 2024, it created a serious problem for Griffin Mission 1. VIPER had been the whole point. The rover was supposed to spend 100 days driving through permanently shadowed craters, drilling into the regolith, and measuring water-ice concentrations that could determine whether the south pole was a viable resource base for future missions. Without it, Astrobotic had an 800-kilogram hole in its manifest and a lander with no obvious anchor. Astrolab's FLEX Lunar Innovation Platform, called FLIP , filled that hole. FLIP is essentially a scaled-down version of Astrolab's FLEX rover, which is being developed as a commercial utility vehicle capable of serving as a logistics platform for future lunar bases. The FLIP variant that will fly on Griffin weighs about 500 kilograms, making it the heaviest U.S. rover sent to the Moon to date. It can carry an additional 30 kilograms of secondary payloads on its deck. The science objectives shifted somewhat with the swap. VIPER was purely a water-ice scout. FLIP is a technology demonstration with broader ambitions: proving mobility at the south pole, testing telerobotic operations, validating solar power generation in an environment where the sun barely crests the horizon, and characterizing how lunar dust behaves over the rover's surface during extended operations. Astrolab will also run navigation, guidance, and communication experiments that feed directly into the commercial services it plans to sell to future operators. VIPER vs. FLIP: What Changed • VIPER (canceled July 2024): NASA-built, ~450 kg, focused on water ice detection via drill, 100-day south pole traverse, science-only mission. • FLIP (current primary): Astrolab commercial, ~500 kg, tech demonstration with mobility, telerobotic, and power experiments , pathfinder for the larger FLEX commercial rover. • What stayed the same: Griffin lander, south pole destination, Nobile Crater region, Falcon Heavy launch vehicle, CLPS contract framework. • What NASA lost: Direct science on water ice distribution. FLIP carries instruments but does not replicate VIPER's dedicated ice-detection drill. The Nobile Region: Proven Prize Territory AI-generated image The lunar south pole's permanently shadowed craters, including Nobile, are the primary targets for both scientific ice-detection missions and future commercial operations. Credit: AI-generated / Cislunar News Griffin's target is the Nobile Crater region, adjacent to Mons Mouton. Both sit near the south pole, where the sun's angle is so low that crater floors remain permanently shadowed and temperatures never rise above -160 degrees Celsius. Those conditions are exactly why hydrogen measurements from orbiting instruments suggest water ice may be concentrated there, preserved over billions of years from cometary impacts and solar wind interactions. The south pole is also where Artemis's lunar base ambitions are pointed . NASA's roadmap calls for infrastructure near the pole to take advantage of both water ice as a potential propellant source and the nearby sunlit ridge peaks, which receive near-continuous solar energy. Griffin, if it lands successfully, would be the first spacecraft to reach this specific area. Intuitive Machines' IM-2 mission attempted the south pole in March 2025 and tipped on landing. That failure is part of why Griffin's terrain relative navigation and hazard detection systems carry so much weight. The lander uses LunaRay, Astrobotic's custom simulation software, to generate real-time 3D point clouds of the surface during descent. Doppler LiDAR feeds into the hazard avoidance system, which is designed to detect obstacles as small as 15 centimeters and abort a pre-planned landing site selection in favor of a safer alternative, all autonomously, in the final seconds of descent. Mission Lander South Pole Target Outcome IM-2 / Athena Intuitive Machines Nova-C Mons Mouton Tipped on landing, Mar 2025 Griffin Mission 1 Astrobotic Griffin Nobile Crater / Mons Mouton Target: July 2026 launch VIPER (via Blue Origin TBD) Unconfirmed South Pole (TBD site) Target: No earlier than 2027 Falcon Heavy and the Path to the Pad AI-generated image Griffin Mission 1 will launch on SpaceX's Falcon Heavy from Kennedy Space Center LC-39A, targeting no earlier than July 2