“Launch called off for tonight due to anvil clouds over launch site (lightning risk),” Elon Musk tweeted, his language highlighting the merciless exactitude of rocket launch parameters. For the second day running, SpaceX’s most ambitious test flight ever Starship Flight 10 was aborted, this time by towering anvil clouds moving over Starbase in South Texas. The clouds posed the risk of lightning, a threat that aerospace engineers allow no room for. One hit can cause devastating electrical overloads, disable avionics, and undermine flight control systems, which the past has evidenced in events such as Apollo 12’s 1969 lightning-induced power failure.
The scrub occurred just fewer than 24 hours after a different disappointment. The countdown was halted at T-minus 39 minutes on Sunday because of a liquid oxygen leak in the ground-side quick disconnect system, a key interface that delivers supercooled propellants into the rocket tanks. Overnight, crews labored to get the system back online, but no respite was afforded Monday weather. “Standing down from today’s flight test attempt due to weather. Starship team is determining the next best available opportunity to fly,” the company tweeted.
Flight 10 is more than a show it is a critical engineering test for the 394-foot-tall, fully reusable Super Heavy–Starship system, the largest and most powerful rocket in history, with over 16 million pounds of liftoff thrust. The mission profile is intended to drive both stages into difficult recovery situations. The Super Heavy booster would accomplish a controlled splashdown in the Gulf of Mexico on a fraction of its three-center Raptor engines, with supporting power from one in the middle ring, to mimic a failure-tolerant landing burn. The test would confirm redundancy strategies for subsequent tower “catch” attempts.
The second stage, Ship 37, would fly a suborbital path, releasing eight Starlink satellite simulators via a specialized hatch a requirement because Starship does not have a conventional payload fairing. The simulators, the size of next-generation Starlink satellites, would not be left in orbit but rather ride along behind the spacecraft to a planned splashdown in the Indian Ocean. Halfway through the flight, engineers would perform an in-space relight of the Raptor engine, a move key to future deep-space missions.
These tests are critical not just to SpaceX’s Mars plans but also to NASA’s Artemis III lunar landing design. The agency’s $3 billion contract is contingent upon a derivative Starship to transport astronauts from lunar orbit down to the Moon’s surface. To accomplish that will take 10 to 20 successful tanker flights to refuel the Human Landing System in orbit a cryogenic propellant transfer milestone never before accomplished. Musk repeated in the livestream, “No one has ever demonstrated propellant transfer,” so ensuring that the first attempt doesn’t come until next year. The engineering hurdle is controlling microgravity boil-off of supercooled oxygen and methane, something that SpaceX has not yet publicly described.
The logistical intricacy of launching and retrieving a vehicle of such size is staggering. Starship’s propellant cargo liquid oxygen and liquid methane cooled to close to their boiling points needs to be pumped into stainless steel tanks within close thermal tolerances. Any postponement, like Monday’s weather delay, can lead to propellant heating and necessitate partial or complete resupply. As spokesperson Dan Huot explained, “We don’t have to refill all the water tanks because we didn’t fire off the deflector, but we’ll have to reload the prop.”
Weather limitations on rockets are formalized in rigorous launch commit criteria. Anvil clouds, specifically, are checked for the possibility of initiating lightning via an ionized exhaust plume of a rocket. NASA and the US Space Force use field mills, radar, and visual observation to evaluate electric field strength before issuing a “go” for launch. In the case of Starship, with its unprecedented thrust and exhaust volume, the risk equation is even more risk-averse.
Flight 10 follows an acrimonious development period for the Starship generation, including a 25% fuel tank increase, improved avionics, and more powerful flight computers. Of the previous three flights, two exploded about 10 minutes after takeoff, and one was destroyed upon reentry owing to pressurization complications. Failures have left debris fields across the Caribbean, causing concern among Texas and Mexican activists about noise, habitat disturbance, and chemical contamination.
In spite of the failures, the iterative test philosophy of SpaceX doesn’t change: fly, fail, learn, repeat. SpaceX has only two remaining flights with this Starship configuration before moving on to an even larger design. For mission planners and engineers, every scrubbed flight still provides useful operational data ranging from propellant management under delay to optimizing weather forecast models for ultra-heavy-lift launches. And for NASA, each delayed test highlights the tight and ruthless schedule to fulfill its lunar goals before other programs touch the Moon.
